We LOVED our stay at this place!! Great location near The Vatican and Castel St. Angelo. Alexandria was fantastic-- she arranged a car service to pick us up at the airport and met us at the flat. She spent about 30 minutes showing us the place, giving us some tips about our visit to Rome and going over her (excellent and very detailed) binder of nearby things to do.
The flat itself is spacious and comfortable, and has the most fantastic balcony. We drank wine out there every night! There are four flights of stairs to get up there (no elevator in the building), but it's totally worth it. Perfect home base for your trip to Rome!