We had a perfect stay at Tommaso's place. It is perfectly located 3min walk away from the Piazza San Pietro (especially advisable if you are interested to visit the church - in the morning - regularly).
The apartment is located in the souterrain and is exactly as shown on the pictures: everything is new, it was cleaned very well and the decoration and ambiente has been very nice. Compared to a hotel room, this place is very recommendable if you are travelling with four people, all beds were very comfortable and we had enough space to also spend some time in the flat. Further, the kitchen was perfectly equipped so that we were cooking every day.
There are a lot of nice shops in the area and Tommaso has provided us with a very long list of resturants and bars which were all great. He was beyond that very obliging, supporting (e.g.offered us to call a taxi), flexible regarding the check-in and very responsive to our questions. This accomodation has contributed essentially to our amazing stay at Rome, 100% recommendable!