We had a great stay in Fabrizio's flat, which is located about 10 minutes from the Termini train station and a couple of minutes walk from some great restaurants, a well supplied supermarket and gelaterias.
Before the stay, Fabrizio replied quickly to our questions, and was waiting in the flat for us at the agreed time. The flat was clean, well furnished and provisioned with some basic supplies in the kitchen.
As other reviews have mentioned, the shower dimensions are quite tight, and we were careful with using hot water after running out on the first evening.
Overall I would definitely recommend this apartment to any couples who are visiting Rome.