This is a great apartment, it is very well located, just a 15' walk to the Vatican, nearby a train station and a bus that can take you downtown. The apartment was very cool even tough outside we had temperatures near 39 degrees celsius (it has AC).
Giulia is a lovely host: she gave us all the advices we needed for transportation, cared for us when we called her, we couldn't ask for more.
There is a supermarket in the nearby that opens 24/7 , very convenient.
Also: prepare to walk. It is much better to visit this charming city by foot and discover the little restaurants, monuments or churches, than to take public transportation where you will be most of the time crammed in the buses.
If we get back to Rome one day, we will surely come back to this place.