Federico's flat is very nice! It has a perfect location, every places (colosseo, basilica di San Pietro, Vatican) very close to it! About 5 minutes walking and you'll getting the Piazza campo de Fiori! From morning till afternoon it's market where you can buy cheese, vine, fruit and souvenirs and in the evening it's a place for relax where you can have a super, because there is so much cafe/restorants on it!
Recommend!!!