I went to Rome in May with my fiancé. We were looking for a nice and quiet place, close to everywhere at a reasonnable price. Daria's Penthouse was absolutely perfect! Very clean, very bright, well furnished and decorated. The patio is very romantic, the view on Rome's roofs so pleasant. From Daria's place you can go everywhere by walk: 2 mins from Piaza di Spagna, 10mins from La Fontana di Trevi o la Villa Borghese, 15mins from Il campo dei fiori... We went also to the Vatican by walk. But if you're lazy, the subway is nearby.
Daria's was a perfect host, very welcoming, very discrete and always available. She left many guides to help us enjoying the city.
In short: the perfect place to discover Rome!