Stayed at Fabio's place for 3 nights and loved it. It's very well located and is hardly a 7 mins walk from St Marks and also the St Zaccaria vaporetto stop. Fabio was there to receive us and give us a brief tour, but we didn't see him after that.
The room is comfortable and clean and the private bathroom is also modern and spacious. The room overlooked the canals and it was amazing to wake up in the morning and see Venice slowly waking up too. The air conditioning worked well too.
One thing which stood out for this B&B was the graciousness of Fabio's father, Mr. Giorgio, as a host. He is the one who interacts with guests every morning at breakfast, which he set for us. He gave us great tips on where to go and how to get there. He even advised us where to go for a gondola ride, so that we could have our ride in peace and not get stuck in a high traffic canal - and he was bang on! He is a very sweet man and we loved talking to him.
Definitely recommend this place if you want to stay in a convenient, comfortable and clean place in mainland Venice, with a killer view!