We stayed for two nights, which is on the mainland. 20-min commute to the island, and located close to bus and tram stations - 10-15 min walk from Mestre train station. This place is also quite close the Mestre city center.
I would have given 4 stars but for the kitchen being ill-equipped. It did not even have a microwave or a bread toaster... Also, the mattresses on the beds were lifeless and did not provide good support for a good night sleep.