My husband and I had a wonderful trip to Rome and we really enjoyed our stay in this charming flat. It was very well decorated and the location superb.
It might be a little too small for 4 people for more than 2-3 days.
The San Giovanni Metro station is appr. 750 meters away and has no escalators so we would recommend either the Manconi or the Colosseo Station when you arrive with heavy suitcases.
Everything worked very fine regarding arrival and departure.