Monica's place is amazing - I would definitely recommend staying there. It is located in a great area of Rome, close to boutiques, restaurants, and bars. It's also easy to walk in any direction to the various sites worth seeing. The apartment itself was very clean, cozy, and unique - tons of nice personal touches with the set up and decor (and the terrace is great). Three of us stayed there and we had more than enough space. Monica and her sister were also very responsive.