We were 6 adults and a 5 months baby traveling through Europe.
We did not met Mario but Paolo. They gave us quite a lot of recommendations and information previous to our arrival.
Thanks to Paolo for the time and to give us quite a lot information at our arrival.
The apartment is an excellent place in San Marcos. We were in the best place you can expect in Venice. Very well equipped apartment (more than usual), nice beds, baths, living area, etc.
The place is close to the most of the attractions in Venice. A supermarket is 10 minutes walking or even less.
If you want to stay in Venice, definitely this is the place. Highly recommended.