We stayed 3 nights in total at William's apartment. The location is great, a few block from the Coliseum. A taxi to the Vatican City around 15-20 Euros
A lot of restaurant and cafes around that area. As you can imagine we only went to the apartment to take a shower and sleep. William was nice to let us stay after the check out since we would have to wait for our next flight. There a little of delay on the check-in but that was due our sim cards that we bought at the airport were not working and we could not communicate with William, other than that we had a great time in Rome.