We spent 11 days in May in Giovanna's flat as a party of 4. We selected the flat because it has a lift and we needed it for an elderly person - a rare feature in Venice (there are still some steps but it was manageable).
The flat is much better then the photos show. It is located in a beautiful landmark building from the 1950s. We appreciated the layout, rooms are reasonably large. It is equipped with AC (except for 1 bedroom) but we did not use it because of the mild weather. It is a pleasure to have drinks or meals on the balcony, from which you can see the Giudecca Canal. There was plenty of space for our things and suitcases in each bedroom. It is well equipped (Wifi ok, dishwasher and washing machine, big fridge and freezer, etc.). You can really cook, which wwe found great because you can avoid expensive restaurants. What would have made it really exceptional: more towels (just 1 per person for 11 days is a little stingy) and some dish towels, a real bedbase in the masterbedroom to make the bed softer.
The location is great: just in front of a line 5 stop, and less than 400 m from stops of lines 1, 2, 4, 6, and the Blue line to/from the airport). It makes it really easy to visit all parts of Venice and to connect with the train station, bus station and airport - and of course it is very close from Salute Church , Guggenheim and the Accademia. The area is rather residential, and the closest supermarket we found was 2 vaporetto stops away. We also bought food from the Rialto market, connecting with the 1 line. Fundamenta Zattere are a pleasant area, not (yet ?) too much invaded by tourists, and you find some pleasant cafés and restaurants.
Communication with Giovanna and with the local person in charge was efficient. We are familiar with Venice and speak Italian, so we did not need any tips about the city and surroundings.