Salvatore's apartment completely surpassed all our expectations. Here's why:
Firstly, location: there's a great supermarket nearby, and very close as well there are awesome shops, restaurants (including a very cheap and delicious pasta restaurant), and it's also within walking distance from all major attractions in Venice.
The apartment itself: it's exactly as described and according to the pictures. The beds are very comfortable and Salvatore leaves for the guests all the amenities one can ask for: soap, coffee, moka coffee maker, dishwasher, washer machine (not dryer, though), bottle of wine, orange juice, a bottle of beer, shampoo, moisturizer... You name it!
Downsides: one of the bathrooms is on the third floor, which is a bit of a climb if you need to go in the middle of the night. Also there is no air-conditioning in the bedrooms, only in the living room.
All in all, if I go to Venice 100 times, each time I would like to stay in Salvatore's apartment.