We (both 59) found Valario's apartment easily accessible from FCO by taking the SIT bus to the Via Aurelia stop and walking according to Google directions. Valerio was able to meet us earlier than his listing stated and led us through a locked outer gate, a locked lobby door and a bolted apartment door into his rooms which were located on the quiet backside of the building overlooking well kept patios and balconies. The listing pictures are accurate and, important for us, we found the bathroom fixtures to be extremely clean and modern with none of the infamous Italian tiny-shower or drainage issues.
The neighbourhood is typically Italian and devoid of the usual shoulder-to-shoulder tourists, which means better value of all services. By turning right when leaving the outer gate, one will find a morning market running north for about three blocks and containing stalls displaying vegetables, fruits, cheeses, breads, meats, clothing and general wares. Continuing through the market on via Urbano II one will arrive at the corner of via Silvestro at a cafe with a nice outdoor patio. Turning left from the apartment's outer gate and following via Boccea and then Circonvallazione Cornelia to the block just south of the via Aurelia, one will see the Farro e Ghisa Griglieria, Wine Bar and Pizzeria where we spent two lovely evenings. If one wants a more upscale dinner I recommend the Osteria Romana at via Aurelia, 553.
Although transportation by bus or Metro is available close-by, we walked to the Vatican and back on our first night, to the Villa Borghese the next day, and through the beautiful and serene Villa Doria Pamphili to the Trastavere district the day after that. No matter how one wishes to get around, this apartment is well located; my only recommendation would be to avoid the bus (#46 to/from Venezia is the best) during rush hour and take the Metro to/from Cornelia instead.
I did not give this listing the best rating for two reasons; the first being that IF travelling to Rome for the first time I would want a place closer to the tourist sites as Rome is exhausting due to the myriad of attractions, and second that although we had a lovely supply of hot water under good pressure for most of our trip, on the morning we departed there was only cold water. In contacting Valerio he stated this had never happened before but you might want to ask him if a problem had been found and fixed.
Lastly, this apartment belonged to Valerio's grandfather and it has been thoughtfully renovated so it was no real surprise when we found him inside on coming back our last evening - if it were my place I would also want to check on things. Just be prudent while abiding there.