My girlfriend and I had an excellent time in Marcella's place. The apartment was in a perfect location, just a three minute walk from the always active Piazza Navona, and near a great selection of restaurants and bars (Bar del Fico was great!)
The apartment itself was the perfect size, well lit with natural sunlight and very nicely maintained. The bathroom was large and very clean. The kitchen was well set up, though we did not need it during our stay and the beds and couch were extremely comfortable. We also enjoyed the excellent bottle of Chianti Marcella left us during our stay :)
Marcella was also the perfect host. She went above and beyond during the check in process, and even supported in working out a ride to and from the airport. She was also in the apartment when we checked in, so she showed us around and gave some suggestions on where to go.
Overall, a perfect stay in Rome, and I would gladly return to the spot and recommend for others.