Wonderful place to stay! It's a 2 minute walk to San Marco and the vaporetto stop, and about 10 minutes (give or take, depending on crowds) to Rialto. Finding the place was a dream, thanks to the detailed directions he gives; he was very quick to respond to my questions, also.
The only thing that I wasn't thrilled with was the fact that my private bathroom was not en suite. I adapted, but if this is a deal-breaker for you I suggest asking first.
I have never stayed at an Air BnB that was as clean as Adriano's place.