We stayed in Massimo's apartment for two days and had a good experience. Even though we didn't meet Massimo, the check-in process was very simple and getting to the apartment was not a problem (just be aware that you will have to fight through a crowd in order to get to the building's entrance!) The location is fantastic and quite central to most of the main attractions in Rome. We were very comfortable there, and felt very safe. The neighborhood is quite busy due to the close proximity to the Trevi fountain, which is something to keep in mind as there is almost always people around, however it is worth it to fall asleep to the sounds of the fountain at night! Overall, I would recommend.