My partner and I really enjoyed our stay at Lorenzo's space in Monti. It's perfectly central to so many notable sites in Rome, and the restaurant options within a short walking distance are fantastic.
The space itself is very clean and stylish. While not especially large, its the perfect amount of space for 2 people that want a quiet, relaxing place to take refuge from long walks through the city. Finally, Lorenzo is a very friendly and responsive host, so you're in good hands with him. Would definitely return.