I was at Maurilio's place for two weeks and enjoyed it a lot. The apartment is in the heart of Trastevere, right around the corner of the local party-place. So, as you can think, it's not exactly quiet. But as I am a nightowl myself I didn't really mind. There are two bedrooms in the apartment and I got the one not facing the street, so it was okay.
Maurilio himself is really nice and will ensure you a pleasant stay. He even helped me when I got ill. And Trastevere itself: You will love it, trust me :)