We really enjoyed our few days in Rome staying at Nico and Marina's place. It is slightly outside the main tourist area, but very easy access, a few minutes from St Peter's Cathedral. But we found it GREAT to be able to get away from the business each day, as Rome is very full of tourists!
The room is simply furnished, but large and with a lot of light (we had a balcony onto a large and open interior patio). The bed is large and comfortable, the bathroom is small, but perfectly functional. Very quiet and pleasant the four nights we stayed.
There is the use of a shared kitchen and fridge, but we only used it to store fruit and cold water.
Nico and Marina were helpful and flexible about our arrival arrangements (there is a charge for check-in after 9pm), and we were able to leave our bags there to collect in the afternoon on the way to the airport (check-out at 10:00am).
Access from Fiumicino quite easy by train.
Recommended!