I would definitely recommand Elena's flat for the location:
2' walk from St Basilio waterbus stop
15' walk from San Marco Piazza
10' walk from Campo santa Margherita where a good part of the nightlife takes place.
Otherwise, the flat is obviously quiet small but it is normal in Venice. The bed is not awesome but enough for some heavy nights after a whole day walking.
But because the flat is only used for renting use, equipment was limited (only one glass of wine and nothing to open the bottle) and no sponge to at least keep a clean place while you occupy it.
But it remains only details.
Elena and her boyfriend arrived on time at the bus stop to show us the way to the flat. They adviced us some good places. Simple welcome but efficient.
Don't forget the 20€ cash at arrival for cleaning as written in the rules.
I would recommand this flat.