We had a comfortable stay at Mario's apartment. Mario is a Super host who attended to all our questions about navigation in the city, and even helped us find our way to his apartment and to the airport. Although we were not able to meet him personally, he kindly arranged for a Friend to pass us the apartment keys at the train station, and his Friend was patient even when we were late for check-in.
Location-wise, the apartment is quite a distance from the city, and the walk from the closest metro station (Battistini) to the apartment is 10-15min uphill. This is not much of an issue as Battistini is the main metro line to reach all the major sights in Rome. As his Friend prepared the apartment for us instead of Mario himself, there were some crumbs in the kitchen. However, we are sure that if Mario prepared the apartment for us himself, it would be in perfect condition.
The best part about Mario's apartment is the really strong wifi. It is also a major plus that washing powder and a drying rack was provided. Overall, I would recommended Mario for his wonderful and attentive service as a host!