We stayed at Frank's apartment for a full week and we loved it!
We were 2 hours delayed and arrived very late, but Frank arranged a pick up at the airport for a reasonable price and when we arrived at the apartment he took the time to explain everything and give us some tips on what to see and where to eat. When we had some questions during our stay we could send Frank a text and he replied very quickly.
The apartment is clean and has everything you need for a short of long stay in Rome. If we have to pick one downside, it would be that there aren't many windows in the apartment which makes it a little dark. But we spend most of our time outside exploring Rome, so it wasn't an issue for us. The apartment is located in a nice neighborhood and close to the metro/trains, restaurants and supermarket. It is in walking distance from a lot of the must sees of Rome.
We really enjoyed our stay and would definitely recommend Frank's apartment!