Massimo's appartment is nice and clean. We were 4 guys going there, and enjoyed our cooking sessions, spending time at the rooftop (located in front of the building), and visiting the city.
The place is nice and rather calm, well-located in Trastevere (try the restaurant just below the building). All facilities indicated were useful, especially air conditioning (40°C!) and the wash machine.
Thanks a lot for the nice stay !