This flat is beautiful and in the PERFECT location. I don't know if you could find a better spot. While all of the other tourists are taking pictures of the Bridge of Sighs, you can just relax in the flat and see it all from your window. You can be in St. Mark's Square in literally one minute, or choose to go the other direction and explore the Castello neighborhood which is more quiet and relaxed and ended up being our favorite neighborhood in Venice to explore without an agenda.
The flat was very clean and, apart from a few basic amenities that could have been better stocked (hair conditioner, dish soap...), has everything that you need for a comfortable and happy stay in Venice.