I recently visited Venice with my family (4 people) and decided to stay at Andrea's Apartment.
As we arrived on the Island via the Water bus, Andrea kindly picked us up and walked us to the apartment. The apartment is in a superb location, just 5 minutes walk from Piazza San Marco (St' Mark's Square). Although the apartment is in the main hub and busiest area of the island, it is located in one of the side streets, so at night times it was very quiet and peaceful.
The apartment was spacious and spotless clean when I arrived. It has all the things which are described on the website by Andrea, but in addition to that complementary tea, coffees, biscuits and a bottle of Wine were also provided. (Thanks Andrea :) ) As we were staying for several days, we decided to buy some food from the supermarkets for breakfast (to save some money!)etc. There are two supermarkets which we found which were both about 10 mins walk from the apartment. Venice is generally a safe area, and the apartment building is very secure too. So we as a family felt comfortable with our surroundings.
Overall, I would give the apartment a score of 10 / 10 because of it's location, it's cleanliness, a great kitchen and Andrea being a great host. If, you are going to Venice, I would recommend you have a look at and consider staying at Andrea's apartment, and don't waste money on hotels.