Our stay in Federico's apartment was fantastic. We arrived late at night and Federico was very accommodating, Elena met us at the doors of the apartment and gave us a tour.
During our stay the weather was very hot so it was great to be able to come back to an apartment with AC and a smart tv with Netflix to chill out for an hour our two.
The location of the apartment is perfect, within walking distance of all the major sites as well as close to some lovely little restaurants, you couldn't ask for more.
I would highly recommend a stay in Federico's apartment for anyone planning a visit to Rome.