Our stay in Andrea's flat was absolutely great. The apartment is so cozy and bright, we just loved it. The studio is just adorable and exactly as portrayed in the pictures, very clean and tidy with just enough space to settle in comfortably (note that the bed flips). The flat is located at a gated building complex just next to a park, it is pretty safe and quiet compared to anything else centrally located in Rome. Although we did not meet Andrea in person, we were provided with a full list of contacts regarding any assistance we would need, and Andrea was very responsive to any of our requests, via phone, in any time during the day. Also the staff and mainly the caretaker was so sweet and polite and helped us with whatever we needed. Note that Andrea's place is very close to the Vatican and about a 15-20 minute walk to the nearest metro/train station (Valle Aurellia) which was just fine by us because you could go anywhere from there. Also a supermarket is located just at the exit of the building complex where Andrea's apartment is, thus you can get anything you might need throughout the day. That said Andrea was so kind to offer us a basket of fruits and some ingredients to make what else, pasta, during our stay, and that was just lovely.
All in all I definetely recommend staying here to have a great time in Rome.