We stayed at Roberto's apt this May.
Roberto is very nice person and very responsible host. It was really easy to communicate with him.
The check-in was very easy, and it was really nice to get some maps and books about Roma (even in russian language) and some refreshments in the fridge...
Roberto also helped us with taxi when we cheked out, because it was rainy outside and it takes about 15 mins walking to Termini.... Its just the special thanks to Roberto)
About apt - if you decide to book it, you should really think twice before and get ready for a wetness inside... Of course there are the AC and fans and etc... So if you are ready to pay attention to opening windows and switching on the fans and all this staff its OK, just read all previous comments and dont be surprised) So we did and had really good time in Roma.
Thank you very much Roberto, we wish to come back to Roma again!!