We really enjoyed staying at Federico's place.
The apartment is clean, quiet and well-equipped. Federico waited until 10:30 pm for our arrival and we would like to thank his for that.
Its location is not far from the historical locations (about 30-40 minutes of walking). The only mini downside is that you have to climb a street before arriving at the apartment. It's not that difficult, just a bit wearying with a stroller (also a bit rough on the knees after a 7-hour day of walking ;)
Thanks again! We would definitely come back.