I spent with my wife 4 nights in this apartment. It is really good accomodation for couples, who wants to see main historical places in Rome.
As for apartment - totaly cleanliness, comfortable and big bed, perfect bed linen, usefull bathroom and spacious living room.
2 AC, so you can regulate a temperature.
Crusial, we were met exactly in time we had agreed.
Definitely, I recommend the Federico's apartment!!