The apartment is part of a closed and quiet complex in a walking distance to St. Peter's Basilica and Castel Sant'Angelo. We never had to use public transport or a taxi. Great communication with Andrea, cute and cozy apartment. We had everything necessary for our stay. Only small discomfort is that the wall to second apartment is very thin but we had discrete neighbors so it was not a problem. We highly recommend the place!
P.S. And our best tip is to use the shared car service (SHARE NOW) from the airport to the apartment and back - it is super convenient and costs just 10-20 EUR depending on the traffic.