We stayed at Federico's apartment from the 4/11 - 7/11. And I must say I was impressed. We had a company of 5 and Federico easily prepared an extra bed for us. The location is FANTASTIC as it is close to the Colosseum and also the metro to get around.
Federico was extremely helpful in explaining how to get to the apartment from the train station and how to get to the airport as well. The wine he provided was also a great and fancy touch. I would definitely recommend staying here to anyone, it is truly a great place to stay!