This apartment is amazing. Don't think, DO.
Donatella is very sweet and Marco is a superstar.
Apartment is actually better than the photos show. It is a bit of a walk from all the sights (20-25 mins to Colosseum) but we actually loved this aspect. Nothing better than dealing with the crazy hustle bustle of central Rome than to come home to this apartment for some wine and antipasto in the sun and just chill. Great amenities too with washing machine and great courtyard on the 10th floor to dry which was great for us in the middle of our 3 week trip.
Marco very accommodating and great restaurant accross the road (Quatro22) and don't forget the boardgames (although playing the Italian version of Scrabble with English words is a different beast - H worth 8 :)