Great experience from booking to checkout! Manuela is very fast to respond and answer questions. Her hospitality is second to none - she personally showed us around the apartment, gave us directions and sight seeing recommendations, restaurant suggestions, and even helped us order a taxi to the airport on the day of our departure. In addition, there was bottled water and juice in the fridge for us when we arrived. Couldn't ask for more.
As for the apartment, it's in a beautiful older building just steps from the Vatican entrance, with two balconies! We were easily able to walk to everything we wanted to see (just under an hour walk to the Colosseum, and lots to see on the way). Supermarkets, cafes, and restaurants all very close by. The one thing to note is that if you have any accessibility issues, this apartment might not be for you. It's on the fifth floor - there is an elevator, but you still need to go up some stairs to get to the elevator; and the shower might be difficult to get into for some people.