Roberto's place is perfectly located in the Prati submarket. Check-in was a breeze, you actually meet Roberto in person where he hands you the keys and shows you the place instead of having to fiddle with a lock box and guess which key opens what. He is happy to explain getting to the apartment and arranging for transportation if you've never been to Rome.
The apartment is very spacious, clean, and functional for any traveler and located 2 blocks from the Ottaviano metro station or less than a 5 minute walk. There are numerous places to eat and drink in walking proximity to the apartment. The Vatican is less than 5 minutes away and it was very nice to be able to wake up early and not have to taxi or metro to make a morning tour of the Vatican!
Tldr - awesome place highly recommended!