Convenient location to Trevi Fountain and the Pantheon and walkable distance to the Colosseum. Quick 10 minute taxi to the Vatican. Virginia was very quick to reply to all my messages, and she said up our transfer from the airport and to the train station for arrival and departure, which was extremely welcome being our first-time to Rome. She also allowed us to store our luggage in the apartment before check-in time while the cleaning people were finishing up, which allowed us to get started touring the city.
I cannot say enough nice things about the apartment, the only flaw would be the finicky locks, but this is not uncommon in Italy, so just be persistent!