Has anyone heard of this hotel ?
Here is an alternative to Ca' dei Conti
Ca dei Dogi...rated 12th of all hotels in Venice, but at very low prices, and next door to the Dodges palace, (San Marcos square) hence the name.
http://www.tripadvisor.com/Hotel_Review-g187870-d571526-Reviews-Ca_dei_Dogi-Venice_Veneto.html
Bill