We had a wonderful time in Rome. Federico's place is spacious, comfortable, clean, private and quiet, and full of character. Air conditioning is a big plus during summer. It is also located next to many good restaurants ( we particularly enjoyed Nonna Betta) in the historic jewish ghetto area.
We appreciated all the restaurant recommendations by Federico. Federico himself was extremely pleasant and helpful.
One downside is that there are no metros close by, however it is within walking distance of the Colosseum, Pantheon, Trevi, etc.
Overall, we would definitely recommend this beautiful loft!