We had a great stay at Condominio Monti - very good service, comfortable bed, very clean, and best of all was the location down the street from the Colosseum. Cocktails at the rooftop bar upstairs were very good as well.
Our only complaint was that the noise levels from the hallway carried quite a lot into the room, especially on the fourth floor where guests had to take the stairs to get to breakfast. But, we would probably still stay here again given the location, price, and quality overall.