My husband and I enjoyed our time at Matteo's place. Matteo was easy to communicate with and he even set up a driver to/from the airport. He laid out maps and made restaurant recommendations for us. The AC worked well and the bed was comfortable. I don't have any reservations about recommending Matteo's. You can tell Matteo is a professional at this.
Location wise, Matteo's place is a short 5-10 min walk to the Colosseum and Roman Forum. The closest metro station is the Colosseo station which is about two stops from Termini, the main station where the two lines intersect.