Manuela's place is a great place to stay. The location is amazing - a block from Piazza Navonna, a small grocery store practically next door, a number of good restaurants within a block, and it came very well-stocked. The windows mostly face a church so there is a lot of privacy. The apartment also has a lot of light.
Davide, the manager, is wonderful and extremely responsive. One thing to note is that there is no microwave, and you need to light the gas oven. Also you have to walk up roughly 30+ stairs to get to the apartment. We enjoyed looking down from the front windows to see and hear the festive street scene below and did not have problems with the noise, though you may wish to bring earplugs if you choose to sleep in the front bedroom and are a light sleeper. We would definitely book Manuela's place again if we come back to Rome!