I would definitely recommend Matteo's apartment to anyone coming to Venice. It's right in the middle of the San Marco area and very close to the most famous places in the city.
We found the apartment to be very clean and comfortable, perfect for 2 people. Matteo met us at the water bus stop and led us to the apartment, so we had no trouble getting there.
The only thing the apartment didn't have was Wi-Fi, but it's available at almost all the bars and restaurants in Venice, so it wasn't a problem.