Mario was an excellent host from the moment we arrived. He gave us great tips on where to visit in the area - it's definitely worth trying the food recommendations.
The room was clean and well furnished. The appartment is located above the local Coop Supermarket which has a wide selection of food, drink and other essentials. With the kitchen, it is very easy to home-cook if desired.
The bathroom is shared but Mario is very accommodating - it was always available when needed.
The apartment is ideally located in central Giudecca - a very short walk from the local water bus (ACTV) stop - Giudecca Palanca. The main centre of Venice can be accessed in a few minutes by 1 stop on the water bus to Zattere.
It is also worth asking Mario about the boat ride experiences that he offers. We took his invitation and it was one of the highlights of our stay!
Overall, we can't recommend Mario highly enough - excellent in all regards.