The flat is even better and cosier than what you guess through the pictures. There is absolutely everything you need from a facility perspective. The beds are really comfortable and the area dynamic but never overcrowded and pretty calm in the evening. They are great small shops with local products in this area of Venice. There is also a supermarket just next to the corner.
In fact what really makes the difference is Sandra herself. She is very kind and flexible (I arrived in the afternoon instead of early in the morning as agreed). Ok, she is a great host, but also the best guide-adviser you can expect. She took half an hour to present me the main, but also hidden treasures of Venice, everything on a map. She also brushed me a very various and complete picture of the nice and truly venician restaurants (I mean not the one you have on Tripadvisor, but the really local ones).
All in all, do not hesitate, book and will not be disappointed.