We really loved this place and would not hesitate to book it again. It is story-book charming. The apartment is bright and spacious, the rooms are good sizes - even the one with the single bed. And the terrace, with its view and the sound of the bell tower of Santa Cecilia, is the first place you'll want to be in the morning and in the twilight. It was one of the main reasons we wanted to stay in the apartment. The location is ideal. It's steps away from a super hip and very good cafe called 'Name Not Found' and across the street from a very good trattoria. (Le Mani In Pasta) and next to a bakery where we bought Roman flatbread for breakfast. The bakery carries the staples: milk, juice, wine, beer, soap and toilet paper and also boast a very decent deli. The neighbourhood is a welcome respite from the craziness of Campo dei Fiori and Fontana di Trevi yet you don't feel isolated. It's near lots of other restaurants, and a short walk to the Tiber and bridges towards the Colosseum or Victor Emmanuelle monument.
Our only quibble is that the some of the furniture needs to be replaced. Two wooden chairs in the living room were so wobbly we couldn't use them to sit in comfortably. Although, we spent most of our sitting time on the terrace there were a couple of chilly nights during our stay. We couldn't all sit comfortably in the living room. We had no expectation of any high end furniture but it would have been nice to have an armchair or two for relaxing in and reading a book. There is the couch, of course, but we were five people. Similarly, the two chairs in the kitchen also need replacing.
We did experience electricity problems through no fault of the place. I mention this only to say that the management were quick to respond and we really appreciated their attentiveness with the problem.
We highly recommend 5 via Genovesi.