This was the first time I've used Air B&B and it was great! Federico is a one of a kind host (My Mum and I have stayed at 2 more since Venice) he takes such time and effort to explain where you are and suggestions on what to do as well as explaining how to get to and from the islands. Additionally our train was delayed by 2 hours and he still met us at the train station and even though he had other people arriving that night we didn't feel rushed or that we had put him out.
The apartment itself is just like the photos. There is flywire to keep the mosquitos out. The bed is comfortable.
We loved the location, pretty much everything was walking distance.
I really can't recommend staying here enough, we loved Venice and feel that staying at this apartment contributed greatly to our overall experience.