Elena's apartment is lovely and the main bedroom is particularly spacious with plenty of storage, if you need it. agree with others that the second bed is uncomfortable, though. Venetian law means that air conditioning cannot be used between midnight and 8am, so be aware that it can get quite warm in the night, if you're there in the summer!
The location is perfect, right on the canal but away from the crowds and blissfully peaceful, though moments from Zattere with its bars and restaurants. The vaparetto stop is less than 5 minutes away and Piazzale Roma, the main transport hub, just a 15 minute walk when you know where you're going.
Elena was a great host, replying to all our questions and I'd recommend her apartment to anyone looking for a great stay in Venice.