Our 2 night stay at Maria's apartment was a pleasant one. It was on late notice and Maria was very flexible with the arrangement. The apartment was clean and spacious and well priced compared to others in Rome. One surprise was that it was on the 8th floor of an old building with a small service lift. No problem for me and the kids just my wife. There was a supermarket directly below which was very handy and public transport close by. I must also mention a great restaurant that Maria had recommended just around the corner called Un Angolo Di Sicilia. We had a wonderful experience of Sicilian style cooking here. I think it was around 1km straight to the Vatican and we made use of the red on/off bus once there, to access the main attractions.
All and all a very suitable stay without breaking the bank.