For its gorgeous view of the rooftops of Trastevere alone, you should definitely, definitely stay at Casa Vicolo del Bologna. Furthermore, the apartment is lovely, and the neighborhood is lively, and extremely picturesque. It is filled with restaurants and on the weekends it seems all of Rome comes out to party here so you can't help being swept up in the vibrant scene (don't worry, where the bedroom is located, it is nice and quiet). To top it off, Anna Rita was an extremely gracious and welcoming host who oriented us to the apartment and directed us to the best gelato I tasted during my entire time traveling in Italy. The local shopkeepers are so kind and helpful, too. My husband and I hope to stay here again someday, but in the meantime, this was the perfect introduction to Rome.