I and my wife had a very good stay at Mario's apartment which is very central in Venice and less than 10 mins walk from train station which is very convenient if you are coming to Venice by train.
Mario was very prompt in replying to all our queries. He sent his friend Agostino to pick us from an end of a bridge which was close to train station and he was very friendly, walked us to the apartment and gave us helpful tips.
The apartment was clean, spacious and safe. We would love to stay at the place again if we ever come back to Venice.