The apartment is wonderful. Clean, spacious and very quiet. Roberto provided everything we need. Carla is warm and very professional. She provided lot of helpful information. The apartment is about 10 minute walk from rail station. The water bus station is 3 minute walk away. The grocery store is right around the corner. And the famous Frari church and Scuola grande di San Rocco is less than one minute from your apartment.
We had great time in Roberto's place.
One suggestion: when you arrive, do not trust the direction given by google map. Trust your host's direction. In Venice they number the house in a different way.