Fernando was a great host. He arranged an airport transfer for us and was waiting for us on arrival. He even allowed us to arrive earlier due to an early flight. We got an explanation of the appartment so we were well set to stay there. He was always available if we had any questions. The appartment has some good beds, I personally slept on the foldout couch and slept quite well. Enough airconditioners to keep each room at a nice temperature. Stove worked well or go to one of the many restaurants around the corner. On a side note, I can recommend checking out La Taverna dei Quaranta (around the left corner just down the street). Supermarket is also literally just around the corner.
Location is very nice with the colosseum just out the front door. Metro Colosseo about 4 minutes away and bus stops and a taxi stand in front of the door. Due to central location you could even walk to all the main sights.
Only things to take into account are the long staircase to get to the appartment and the winding staircases in the appartment itself. As well as the sounds from outside. Not so much from the people, but more the traffic passing by etc.. The windows don't provide much sound isolation. I'm not a heavy sleeper, but slept quite well. However, if you are a very light sleeper it might be an issue.

We had a great stay and wouldn't hesitate to return to this nice appartment. Thank you Fernando.