What a fabulous spot, very close to the Vatican city walls, a super metro and handy supermarket across the way and good bar a few doors down. Federico's apartment has 3 double beds, one bath, a great balcony a lounge/diner and kitchenette. It has everything you need for a stay in Rome plus Federico provides a super introduction to Rome, what to do, where to go, how to get there and where to get tickets from. The lift to the 7th floor def takes the strain out of climbing the stairs :)
Being so well located, we managed to fit in loads - we attended the Pope's blessing (St Peter's Square is less than a 10mins walk), visited the Vatican City - bus tour, highly recommended - took a tour at the Colosseum (def worth 15 euros for the tour guide) and the Leonardo Exhibition close to Flaminio Metro station. The Roman Forum and Colosseum were free entry whilst we were there (lucky timing) - make sure you use the entrance to the Roman Forum in Palatine Hill or you'll be waiting an eternity to get in... and we found loads more free things to do too including looking at multiple churches, beautifully decorated (we left contribution for upkeep, but it's not mandatory). The Spanish Steps are worth climbing and taking the No 2 tram from outside Flaminio metro takes you out to the Olympic Stadium, which we found was not open to the public :( but still spectacular to see if you're a sports fan.
We loved Federico's apartment so much we're likely to come back, esp as we haven't seen all you should see in Rome.
Ciao bella.