This place is wonderful. Clean, beautiful and well appointed. As every other review states, you are literally on top of the Trevi Fountain. Raffaella and her husband have tended to all your needs and you want for nothing.
Just a note though, my wife and I stayed there over the weekend and contrary to other reviewers we could hear many rowdy people through the night, bottles smashing and yelling from 3am onwards. It didn't bother us, but just so future tenants are aware that there can be noise problems.
We had a wonderful time in Rome and at Trevi Maison. Thanks Raffaella. Ciao