• Login or Create Account

  • Currency

    QAR

You are booking hotel for more than 90 days

Ca' Mariele

01234
34 Property Photos
Ca' Mariele
hotel image
hotel image

About Property

Ca' Mariele is a 5-minute walk from Venice’s Piazza San Marco. It features air-conditioned accommodations, free Wi-Fi throughout ...Read more

Amenities

  • Wi-Fi
  • Smoke Detector
  • Room Service
  • Air Conditioning
  • Ironing Service
  • Housekeeping
  • View All

Add dates to check availability

4.5
Excellent(585 RATINGS)
San Marco

San Marco

10 minutes walk to St Marks Square (City Centre)

Change Dates and Guest(s)

Check-in: 2:30 PM - 7 PM | Check-out: 10 AM

Check-in date
Check-out date
Rooms, Guests

Ca' Mariele Location

Address: San Marco 3523

10 minutes walk to St Marks Square (City Centre)

TOP ATTRACTIONS

    St Marks Square (City Centre)

    10 min walk

    Rialto Bridge

    9 min walk
NEARBY LANDMARKS

    Campo Santo Stefano

    1 min walk

    Giardini della Biennale

    2.6 km

    Important information

    • Please check detailed rules while reviewing your booking

    • Languages Spoken by Staff

      English and Italian

    Hotels in Venice of Same Star Category

    Hotel Ca' Alvise, Venice

    Hotel Ca' Alvise

     0 1 2 3 0 1 2 3 4

    QAR 922

    Per Night

    San Marco

    Four Points by Sheraton Venice Mestre, Venice

    Four Points by Sheraton Venice Mestre

     0 1 2 3 0 1 2 3 4

    QAR 523

    Per Night

    Venezia Mestre

    Venice Travel Dream - apartment, Venice

    Venice Travel Dream - apartment

     0 1 2 3 0 1 2 3 4

    QAR 1,183

    Per Night

    Mestre

    Hotel Monaco & Grand Canal, Venice

    Hotel Monaco & Grand Canal

     0 1 2 3 0 1 2 3 4

    QAR 1,451

    Per Night

    San Marco

    Hotel Lugano Torretta, Venice

    Hotel Lugano Torretta

     0 1 2 3 0 1 2 3 4

    QAR 304

    Per Night

    Marghera

    Hotel Montecarlo, Venice

    Hotel Montecarlo

     0 1 2 3 0 1 2 3 4

    QAR 1,092

    Per Night

    Lido di Jesolo

    Ca' Vendramin Zago, Venice

    Ca' Vendramin Zago

     0 1 2 3 0 1 2 3 4

    QAR 1,460

    Per Night

    Cannaregio East

    Hotel Feel Inn Venice Airport Rooms, Venice

    Hotel Feel Inn Venice Airport Rooms

     0 1 2 3 0 1 2 3 4

    QAR 228

    Per Night

    Campalto

    All’Angelo Art Hotel, Venice

    All’Angelo Art Hotel

     0 1 2 3 0 1 2 3 4

    QAR 1,053

    Per Night

    San Marco

    Hotel Villa Pannonia, Venice

    Hotel Villa Pannonia

     0 1 2 3 0 1 2 3 4

    QAR 811

    Per Night

    Lido

    Other Popular Hotels in Venice

    Palazzo del Sale, Rialto, Venice

    Palazzo del Sale, Rialto

     0 1 2 0 1 2 3 4

    QAR 1,204

    Per Night

    Castello West

    Sun Beach Residence con Piscina - Piazza Brescia - Adria Holiday Jesolo - FAMILY APARTMENTS, Venice

    Sun Beach Residence con Piscina - Piazza Brescia - Adria Holiday Jesolo - FAMILY APARTMENTS

     0 1 2 3 0 1 2 3 4

    QAR 1,986

    Per Night

    Lido di Jesolo

    Empress Theodora Apartments, Venice

    Empress Theodora Apartments

     0 1 2 0 1 2 3 4

    QAR 4,397

    Per Night

    Cannaregio East

    Residence Alla Rotonda, Venice

    Residence Alla Rotonda

     0 -1 0 1 2 3 4

    QAR 1,520

    Per Night

    Faro

    Sunrise Apartment in Giudecca, Venice

    Sunrise Apartment in Giudecca

     0 1 2 3 0 1 2 3 4

    QAR 1,034

    Per Night

    Castello West

    Altana su San Marco, Venice

    Altana su San Marco

     0 -1 0 1 2 3 4

    QAR 987

    Per Night

    San Marco

    San Marco Roof Terrace Apartment, Venice

    San Marco Roof Terrace Apartment

     0 -1 0 1 2 3 4

    QAR 1,324

    Per Night

    San Marco

    Design Suite with Private Jacuzzi and Pool Table, Venice

    Design Suite with Private Jacuzzi and Pool Table

     0 -1 0 1 2 3 4

    QAR 1,179

    Per Night

    Cannaregio East

    Venice Dream House Tosca, Venice

    Venice Dream House Tosca

     0 -1 0 1 2 3 4

    QAR 1,179

    Per Night

    Castello West

    Appartamento Rio, Venice

    Appartamento Rio

     0 -1 0 1 2 3 4

    QAR 893

    Per Night

    Castello West

    Top Places to Stay in Venice ( Popular Areas )

    Premium Hotels in Venice

    Hotel Saturnia & International, Venice

    Hotel Saturnia & International

     0 1 2 3 0 1 2 3 4

    QAR 1,154

    Per Night

    San Marco

    Hilton Garden Inn Venice Mestre San Giuliano, Venice

    Hilton Garden Inn Venice Mestre San Giuliano

     0 1 2 3 0 1 2 3 4

    QAR 623

    Per Night

    Venezia Mestre

    Palazzetto My Venice, Venice

    Palazzetto My Venice

     0 1 2 3 0 1 2 3 4

    QAR 1,859

    Per Night

    Cannaregio East

    H10 Palazzo Canova, Venice

    H10 Palazzo Canova

     0 1 2 3 0 1 2 3 4

    QAR 2,508

    Per Night

    Castello West

    Hotel Carlton on the Grand Canal, Venice

    Hotel Carlton on the Grand Canal

     0 1 2 3 0 1 2 3 4

    QAR 645

    Per Night

    Cannaregio East

    Pesaro Palace, Venice

    Pesaro Palace

     0 1 2 3 0 1 2 3 4

    QAR 683

    Per Night

    Cannaregio East

    Areas Preferred by Indians to Stay in Venice

    Hotels near Popular Attractions in Venice

    Show More

    Properties in Venice

    Four Star Hotels in Venice

    Duodo Palace Hotel, Venice

    Duodo Palace Hotel

     0 1 2 3 0 1 2 3 4

    QAR 748

    Per Night

    San Marco

    Palazzetto San Marco, Venice

    Palazzetto San Marco

     0 1 2 3 0 1 2 3 4

    QAR 675

    Per Night

    Castello West

    Cannaregio II Apartments, Venice

    Cannaregio II Apartments

     0 1 2 3 0 1 2 3 4

    QAR 1,080

    Per Night

    Cannaregio East

    Chiara Lodge, Venice

    Chiara Lodge

     0 1 2 3 0 1 2 3 4

    QAR 519

    Per Night

    Mestre

    Hotel Duca d'Aosta, Venice

    Hotel Duca d'Aosta

     0 1 2 3 0 1 2 3 4

    QAR 438

    Per Night

    Mogliano Veneto

    Annia Park Hotel Venice Airport, Venice

    Annia Park Hotel Venice Airport

     0 1 2 3 0 1 2 3 4

    QAR 824

    Per Night

    Venice Marco Polo Airport

    Venice Heaven Apartments Ca Matilde, Venice

    Venice Heaven Apartments Ca Matilde

     0 1 2 3 0 1 2 3 4

    QAR 1,126

    Per Night

    San Marco

    Charming Venice Apartments, Venice

    Charming Venice Apartments

     0 1 2 3 0 1 2 3 4

    QAR 1,070

    Per Night

    Castello West

    Hotel Bisanzio, Venice

    Hotel Bisanzio

     0 1 2 3 0 1 2 3 4

    QAR 785

    Per Night

    Castello West

    Casa Alla Fenice, Venice

    Casa Alla Fenice

     0 1 2 3 0 1 2 3 4

    QAR 497

    Per Night

    San Marco

    Four Star Hotels in Venice

    Queen Home Paola, Venice

    Queen Home Paola

     0 1 2 3 0 1 2 3 4

    QAR 906

    Per Night

    Favaro Veneto

    Sunrise Palace, Venice

    Sunrise Palace

     0 1 2 3 0 1 2 3 4

    QAR 41,382

    Per Night

    Lido di Jesolo

    Laerte Palace Hotel, Venice

    Laerte Palace Hotel

     0 1 2 3 0 1 2 3 4

    QAR 287

    Per Night

    Mogliano Veneto

    Hotel Indigo VENICE - SANT'ELENA, an IHG hotel, Venice

    Hotel Indigo VENICE - SANT'ELENA, an IHG hotel

     0 1 2 3 0 1 2 3 4

    QAR 1,067

    Per Night

    Venice Biennale

    Best Western Hotel Tritone, Venice

    Best Western Hotel Tritone

     0 1 2 3 0 1 2 3 4

    QAR 538

    Per Night

    Mestre

    HTM Venice Suite by Halldis, Venice

    HTM Venice Suite by Halldis

     0 1 2 3 0 1 2 3 4

    QAR 874

    Per Night

    Mestre

    LH Hotel Sirio Venice, Venice

    LH Hotel Sirio Venice

     0 1 2 3 0 1 2 3 4

    QAR 444

    Per Night

    Mestre

    Albergo Quattro Fontane - Residenza d'Epoca, Venice

    Albergo Quattro Fontane - Residenza d'Epoca

     0 1 2 3 0 1 2 3 4

    QAR 1,123

    Per Night

    Lido

    Casa Alla Fenice, Venice

    Casa Alla Fenice

     0 1 2 3 0 1 2 3 4

    QAR 497

    Per Night

    San Marco

    Oliver, Venice

    Oliver

     0 1 2 3 0 1 2 3 4

    QAR 3,390

    Per Night

    San Marco

    Four Star Hotels in Venice

    San Giorgio degli Schiavoni, Venice

    San Giorgio degli Schiavoni

     0 1 2 3 0 1 2 3 4

    QAR 980

    Per Night

    Castello West

    Hotel Plaza Venice, Venice

    Hotel Plaza Venice

     0 1 2 3 0 1 2 3 4

    QAR 575

    Per Night

    Mestre

    Il Palazzo Experimental, Venice

    Il Palazzo Experimental

     0 1 2 3 0 1 2 3 4

    QAR 1,454

    Per Night

    Cannaregio East

    Santa Croce Boutique Hotel, Venice

    Santa Croce Boutique Hotel

     0 1 2 3 0 1 2 3 4

    QAR 940

    Per Night

    Cannaregio East

    Crowne Plaza Venice East, Venice

    Crowne Plaza Venice East

     0 1 2 3 0 1 2 3 4

    QAR 467

    Per Night

    Quarto d'Altino

    Hotel Palazzo Abadessa, Venice

    Hotel Palazzo Abadessa

     0 1 2 3 0 1 2 3 4

    QAR 801

    Per Night

    Cannaregio East

    Hotel Palazzo Keller, Venice

    Hotel Palazzo Keller

     0 1 2 3 0 1 2 3 4

    QAR 1,666

    Per Night

    San Marco

    Hotel Ai Reali di Venezia, Venice

    Hotel Ai Reali di Venezia

     0 1 2 3 0 1 2 3 4

    QAR 2,415

    Per Night

    Castello West

    Hotel Rialto, Venice

    Hotel Rialto

     0 1 2 3 0 1 2 3 4

    QAR 921

    Per Night

    San Marco

    Residence Ca' Foscolo, Venice

    Residence Ca' Foscolo

     0 1 2 3 0 1 2 3 4

    QAR 1,848

    Per Night

    Castello West

    Five Star Hotels in Venice

    JW Marriott Venice Resort & Spa, Venice

    JW Marriott Venice Resort & Spa

     0 1 2 3 4 0 1 2 3 4

    QAR 5,952

    Per Night

    Lido-Pellestrina

    EXCESS VENICE Boutique Hotel & Private Spa - Adults Only, Venice

    EXCESS VENICE Boutique Hotel & Private Spa - Adults Only

     0 1 2 3 4 0 1 2 3 4

    QAR 1,101

    Per Night

    Cannaregio East

    Hotel Excelsior Venice, Venice

    Hotel Excelsior Venice

     0 1 2 3 4 0 1 2 3 4

    QAR 4,014

    Per Night

    Lido

    Radisson Collection Hotel, Palazzo Nani, Venice

    Radisson Collection Hotel, Palazzo Nani

     0 1 2 3 4 0 1 2 3 4

    QAR 2,032

    Per Night

    Cannaregio East

    Fiori e Frutti Agri Resort Venezia Mestre, Venice

    Fiori e Frutti Agri Resort Venezia Mestre

     0 1 2 3 4 0 1 2 3 4

    QAR 1,182

    Per Night

    Chirignano-Zelarino

    Baglioni Hotel Luna - The Leading Hotels of the World, Venice

    Baglioni Hotel Luna - The Leading Hotels of the World

     0 1 2 3 4 0 1 2 3 4

    QAR 3,295

    Per Night

    San Marco

    Palazzo Venart Luxury Hotel, Venice

    Palazzo Venart Luxury Hotel

     0 1 2 3 4 0 1 2 3 4

    QAR 3,144

    Per Night

    Cannaregio East

    Hotel Gabrielli - Starhotels Collezione, Venice

    Hotel Gabrielli - Starhotels Collezione

     0 1 2 3 4 0 1 2 3 4

    QAR 2,287

    Per Night

    Venice Biennale

    Falkensteiner Hotel & Spa Jesolo, Venice

    Falkensteiner Hotel & Spa Jesolo

     0 1 2 3 4 0 1 2 3 4

    QAR 2,727

    Per Night

    Lido di Jesolo

    Violino D’Oro Venezia, Venice

    Violino D’Oro Venezia

     0 1 2 3 4 0 1 2 3 4

    QAR 3,202

    Per Night

    San Marco

    Hotels By Star Category in Venice

    Show More

    Hotels in Nearby Cities

    Hotels Near By Ca' Mariele

    San Marco Roof Terrace Apartment, Venice

    San Marco Roof Terrace Apartment

     0 -1 0 1 2 3 4

    QAR 1,324

    Per Night

    San Marco

    Hotel Concordia, Venice

    Hotel Concordia

     0 1 2 3 0 1 2 3 4

    QAR 1,063

    Per Night

    San Marco

    Nolinski Venezia - Evok Collection, Venice

    Nolinski Venezia - Evok Collection

     0 1 2 3 4 0 1 2 3 4

    QAR 3,656

    Per Night

    San Marco

    Hotel Palazzo Keller, Venice

    Hotel Palazzo Keller

     0 1 2 3 0 1 2 3 4

    QAR 1,666

    Per Night

    San Marco

    Ca' dell'Arte, Venice

    Ca' dell'Arte

     0 1 2 3 0 1 2 3 4

    QAR 749

    Per Night

    San Marco

    Splendid Venice – Starhotels Collezione, Venice

    Splendid Venice – Starhotels Collezione

     0 1 2 3 0 1 2 3 4

    QAR 1,098

    Per Night

    San Marco

    Venice Dream House Figaro, Venice

    Venice Dream House Figaro

     0 -1 0 1 2 3 4

    QAR 935

    Per Night

    San Marco

    Albergo Bel Sito e Berlino, Venice

    Albergo Bel Sito e Berlino

     0 1 2 0 1 2 3 4

    QAR 707

    Per Night

    San Marco

    Unahotels Ala Venezia - Adults Only, Venice

    Unahotels Ala Venezia - Adults Only

     0 1 2 0 1 2 3 4

    QAR 667

    Per Night

    San Marco

    Antico Panada, Venice

    Antico Panada

     0 1 2 0 1 2 3 4

    QAR 585

    Per Night

    San Marco

    Hotel Bella Venezia, Venice

    Hotel Bella Venezia

     0 1 2 3 0 1 2 3 4

    QAR 860

    Per Night

    San Marco

    Hotel Flora - By Romanelli Family, Venice

    Hotel Flora - By Romanelli Family

     0 1 2 0 1 2 3 4

    QAR 1,465

    Per Night

    San Marco

    Casa sul Molo, Venice

    Casa sul Molo

     0 1 2 0 1 2 3 4

    QAR 1,200

    Per Night

    San Marco

    Hotel Cavalletto e Doge Orseolo, Venice

    Hotel Cavalletto e Doge Orseolo

     0 1 2 3 0 1 2 3 4

    QAR 954

    Per Night

    San Marco

    Benedetto Marcello, Venice

    Benedetto Marcello

     0 1 2 3 0 1 2 3 4

    QAR 1,473

    Per Night

    San Marco

    Ca Princess, Venice

    Ca Princess

     0 -1 0 1 2 3 4

    QAR 511

    Per Night

    San Marco

    San Teodoro Palace - Luxury Apartments, Venice

    San Teodoro Palace - Luxury Apartments

     0 1 2 3 0 1 2 3 4

    QAR 3,348

    Per Night

    San Marco

    Hotel Rialto, Venice

    Hotel Rialto

     0 1 2 3 0 1 2 3 4

    QAR 921

    Per Night

    San Marco

    Residence La Fenice, Venice

    Residence La Fenice

     0 1 2 3 0 1 2 3 4

    QAR 1,502

    Per Night

    San Marco

    Sina Palazzo Sant'Angelo, Venice

    Sina Palazzo Sant'Angelo

     0 1 2 3 0 1 2 3 4

    QAR 2,860

    Per Night

    San Marco

    Palazzo Bembo - Exclusive Accommodation, Venice

    Palazzo Bembo - Exclusive Accommodation

     0 1 2 3 0 1 2 3 4

    QAR 833

    Per Night

    San Marco

    The Venice Nest @ Ca' Del Duca, Venice

    The Venice Nest @ Ca' Del Duca

     0 1 2 0 1 2 3 4

    QAR 773

    Per Night

    San Marco

    Ca Del Sole Venice, Venice

    Ca Del Sole Venice

     0 -1 0 1 2 3 4

    QAR 778

    Per Night

    San Marco

    Ai Cherubini, Venice

    Ai Cherubini

     0 1 2 3 0 1 2 3 4

    QAR 1,033

    Per Night

    San Marco

    Palazzo del Giglio, Venice

    Palazzo del Giglio

     0 1 2 3 0 1 2 3 4

    QAR 936

    Per Night

    San Marco

    Ca' Alle Gondolette, Venice

    Ca' Alle Gondolette

     0 -1 0 1 2 3 4

    QAR 1,325

    Per Night

    San Marco

    Residenza Bistrot De Venise, Venice

    Residenza Bistrot De Venise

     0 1 2 3 0 1 2 3 4

    QAR 993

    Per Night

    San Marco

    Locanda Barbarigo, Venice

    Locanda Barbarigo

     0 1 2 0 1 2 3 4

    QAR 588

    Per Night

    San Marco

    Casa Alla Fenice, Venice

    Casa Alla Fenice

     0 1 2 3 0 1 2 3 4

    QAR 497

    Per Night

    San Marco

    Hotel Dei Dragomanni, Venice

    Hotel Dei Dragomanni

     0 1 2 3 0 1 2 3 4

    QAR 970

    Per Night

    San Marco

    FORESTERIA SOCIALE VENICE SAN MARCO by NEW GENERATION HOSTEL, Venice

    FORESTERIA SOCIALE VENICE SAN MARCO by NEW GENERATION HOSTEL

     0 -1 0 1 2 3 4

    QAR 575

    Per Night

    San Marco

    Venice Dream House Mercerie, Venice

    Venice Dream House Mercerie

     0 -1 0 1 2 3 4

    QAR 1,048

    Per Night

    San Marco

    The St. Regis Venice, Venice

    The St. Regis Venice

     0 1 2 3 4 0 1 2 3 4

    QAR 4,848

    Per Night

    San Marco

    Hotel Ambassador Tre Rose, Venice

    Hotel Ambassador Tre Rose

     0 1 2 0 1 2 3 4

    QAR 563

    Per Night

    San Marco

    San Marco Apartments Steps from St Mark's Square- VHA Collection, Venice

    San Marco Apartments Steps from St Mark's Square- VHA Collection

     0 1 2 3 0 1 2 3 4

    QAR 1,783

    Per Night

    San Marco

    Hotel Mercurio Venezia, Venice

    Hotel Mercurio Venezia

     0 1 2 0 1 2 3 4

    QAR 381

    Per Night

    San Marco

    Hotel Serenissima, Venice

    Hotel Serenissima

     0 1 0 1 2 3 4

    QAR 686

    Per Night

    San Marco

    Antico Casin, Venice

    Antico Casin

     0 1 2 0 1 2 3 4

    QAR 914

    Per Night

    San Marco

    Palazzina Fortuny, Venice

    Palazzina Fortuny

     0 1 2 3 0 1 2 3 4

    QAR 860

    Per Night

    San Marco

    Hotel Torino, Venice

    Hotel Torino

     0 1 2 0 1 2 3 4

    QAR 676

    Per Night

    San Marco

    Residenza Ducato, Venice

    Residenza Ducato

     0 1 2 3 0 1 2 3 4

    QAR 1,581

    Per Night

    San Marco

    Hotel Do Pozzi, Venice

    Hotel Do Pozzi

     0 1 2 0 1 2 3 4

    QAR 579

    Per Night

    San Marco

    Ca' Frezzeria, Venice

    Ca' Frezzeria

     0 -1 0 1 2 3 4

    QAR 1,652

    Per Night

    San Marco

    Ca Del Gambero Canal View, Venice

    Ca Del Gambero Canal View

     0 1 2 3 0 1 2 3 4

    QAR 1,286

    Per Night

    San Marco

    Altana su San Marco, Venice

    Altana su San Marco

     0 -1 0 1 2 3 4

    QAR 987

    Per Night

    San Marco

    Hotel Città di Milano, Venice

    Hotel Città di Milano

     0 1 2 0 1 2 3 4

    QAR 903

    Per Night

    San Marco

    Ca' Invidia, Venice

    Ca' Invidia

     0 -1 0 1 2 3 4

    QAR 1,237

    Per Night

    San Marco

    Baglioni Hotel Luna - The Leading Hotels of the World, Venice

    Baglioni Hotel Luna - The Leading Hotels of the World

     0 1 2 3 4 0 1 2 3 4

    QAR 3,295

    Per Night

    San Marco

    Palazzo Pianca, Venice

    Palazzo Pianca

     0 1 2 3 0 1 2 3 4

    QAR 1,154

    Per Night

    San Marco

    Casa del Carro 1 Grand Master Apartment, Venice

    Casa del Carro 1 Grand Master Apartment

     0 -1 0 1 2 3 4

    QAR 1,410

    Per Night

    San Marco

    Best Hotels in Cities Nearby Venice

    Lido Palace - The Leading Hotels of the World, Venice

    Lido Palace - The Leading Hotels of the World

     0 1 2 3 4 0 1 2 3 4

    QAR 3,352

    Per Night

    Riva del Garda

    Garda Sporting Club Hotel, Venice

    Garda Sporting Club Hotel

     0 1 2 3 0 1 2 3 4

    QAR 1,266

    Per Night

    Riva Del Garda City Center

    Palace Hotel La Conchiglia D'Oro, Venice

    Palace Hotel La Conchiglia D'Oro

     0 1 2 3 0 1 2 3 4

    QAR 362

    Per Night

    Vicenza

    Hotel Omnia, Venice

    Hotel Omnia

     0 1 2 3 0 1 2 3 4

    QAR 555

    Per Night

    Noventa Di Piave

    Wine Hotel San Giacomo Activity & Wellness, Venice

    Wine Hotel San Giacomo Activity & Wellness

     0 1 2 3 0 1 2 3 4

    QAR 480

    Per Night

    Paderno del Grappa

    Albergo Roma, BW Signature Collection, Venice

    Albergo Roma, BW Signature Collection

     0 1 2 3 0 1 2 3 4

    QAR 379

    Per Night

    Castelfranco Veneto

    Hotel Duca d'Aosta, Venice

    Hotel Duca d'Aosta

     0 1 2 3 0 1 2 3 4

    QAR 349

    Per Night

    Mogliano Veneto

    Move Hotels Venice North, Venice

    Move Hotels Venice North

     0 1 2 3 0 1 2 3 4

    QAR 432

    Per Night

    Treviso

    Aktivhotel Santalucia, Venice

    Aktivhotel Santalucia

     0 1 2 3 0 1 2 3 4

    QAR 918

    Per Night

    Torbole

    B&B HOTEL Mantova Cristallo, Venice

    B&B HOTEL Mantova Cristallo

     0 1 2 3 0 1 2 3 4

    QAR 384

    Per Night

    Virgilio

    Flights to Venice

    Flights from Venice

    More info About Ca' Mariele