We (me and my mother) stayed at Federico place for 3 days in June 2014. Federico is very organized person. He showed and explained us everything what we needed and even more. Everything was arranged perfectly.
The apartment is very nice, cozy and has a lot of interesting pictures, books, etc. The room was clean and we found everything for our needs.
Location is convenient. Some of the sights (e.g. colosseum, church of Santa Maria Maggiore) you can easily reach by foot. For other you can use metro which is only 2-4 min from the apartment.