We stayed at Antonello's place for 3 nights and it was amazing. The location is unbeatable, you have everything (literally) a few steps away from the doorway.
Antonello was kind enough to let us check-in early. The apartment was sparklingly clean, and they left us fruit, ham, cheese, bread, coffee, tea, etc. for our stay. That was a great gesture!
The apartment is located in Trastevere, and it's not a super touristy area, so you can walk around without being harassed every 2 seconds by people selling stuff in the street. Also, all of Rome's main attractions, from the Coliseum to the Vatican, are less than 30 minutes away walking, or 10-15 using public transit.
At night it can be a little noisy. But unless you're planning to go to bed early and you need total silence to sleep, this is the perfect place to stay in Rome.