We with my husband stayed in Roberto's apartment for 4 days in January and enjoyed our experience a lot. We had no chance to see Roberto himself, Caterina helped us during the first day-she kindly waited us near the boat station upon arrival, advices about useful tips (such as good restaurants, transport, places of interest...), she also advised us on airport transfers.
The apartment is on the 1st floor, exceptionally clean, bright, spacious, with everything you can imagine for comfortable staying (bath kits, fully equipped kitchen, washing machine and dish washing machine. The only thing we would like to advice future quests- be aware that the floor may be rather cold during the winter time (we found this in Rome, Firenze and Venice, suppose it comes as benefit during extremely hot summer).
Coop supermarket is just around the corner.
The apartment is placed in relatively calm district (except for school nearby, however, there were holidays during our stay), but you can find yourself in the city center just in 5 minutes walking, as Venice overall is mostly pedestrian city.
We highly recommend the apartment and are grateful for Roberto's and Caterina's hospitality.