Our stay at Silvia's apartment near Piazza Navona was a great experience! We love the area...lots of restaurants, cafes, shopping & sites all right there or in very close walking distance. The apartment itself was a perfect fit for our family of 4 (2 adults & 2 teens). The air conditioning was very much needed & appreciated. Our time there was very hot in Rome (early July). Having two bathrooms was very nice. One of them had a lot of counter space. The building itself had a small elevator or you could choose to walk the stairs for a little extra exercise. ;)
We did not meet Silvia in person but she was very responsive in all electronic communications. Her sister met us at the apartment & showed us how everything worked. My only suggestion would be to practice using the key while you are being checked in. It was shown to us but we didn't actually do it ourselves until we were on our own. It's a little tricky to get used to. As time went on, we got better at it.
We had Silvia arrange to have a driver meet us at the airport which worked out perfectly to get us started on our European vacation. We would definitely stay at this apartment again!