I stayed together with a friend at Pieros Appartment. It was absolutely great. The apartment is at a great location, in walking distance to the vatican and in a really nice neighborhood. It is very easy to reach from the airport and a bus and train stop is really nearby. If you like to walk around in a city you can reach anything by walking, but taking the bus is very cheap as well.

The apartment was perfectly clean and very nice. He was there to welcome us as well as for the check-out in the morning and we could reach out to him anytime we needed to. I would recommend him anytime for everyone to stay at his place.
And rome is an amazing city as well. It was absolutely worth it.