I totally recommend Bella’s place. It is really close to the Mestre station (5 min walk) and from then you can take a train or bus to Venice which should take 15 min or less. The communication was great and we were able to leave our luggage before the check in time which was really helpful to us.
Venice was really hot these days and so was the room at night, there is a ceiling fan and a standing fan to help. There is an air conditioner right outside the door so having the door open at least for a while, was the most effective.