Carlo is a very nice host! He come to the train station for picking us up, and also gave us some useful information! We enjoyed the time staying here very much! The room is large and clean, and also the atmosphere is quite and safe nearby! It's easy to get to the house from the Mestre station(by tram). It's convenient to get to Venice, too! It takes about 30minutes to get to the bus station of Venice(tram+bus).
In conclusion, it's out of my expectation!