Me and three friends spent a few perfect days at Rosa's place, which was very clean, silent and close to the Piazza del Popolo. Rosa was very responsive (replied within a few minutes) and could help us out perfectly (the temperature fell during our stay and we needed help with the heating system and she gave us perfect instructions). If I had to find a negative point, it would be, that there only a few windows which are all looking to the inner courtyard, so there is not so much natural light. However, if you are in Rome, there is no reason to stay inside.