Alessandro is a great host : he has been hyper cool with us! The apartement is beautiful ; the bed is very comfortable. Trastevere is a great place to stay in Rome.
The only thing I would say is that the street (during the weekend only) is extremely noisy - and even if the window is very well isolated, one can still here the restaurants and bars downstairs. But if you don't mind noise, it's a perfect place!
Thanks Alessandro.