I had a wonderful stay at Ca' Sora and cannot find any fault - the location was very convenient for me; close to the train station and yet just far enough so it felt like I was in the middle of a quiet, residential and non-touristy area of Venice. It's also far enough from the tourist areas of San Marco and Rialto, but easily walkable.
The apartment was super clean and had everything I needed, plus it was very quiet at night and everything from stove to shower to heating to wifi etc. worked well. Antonio was extremely helpful and communication with him was easy, he always answered my messages immediately - perfect airbnb-host! Very highly recommended, and I hope to stay at Ca' Sora again next time I'm in Venice!