We just returned from Sara's Pincepessa Trevi apartment and we loved every minute of it. Sara was great at all points of contact. From questions before booking, to communications after booking, to arranging a car to pick us up at the airport, showing us the apartment, suggestions around the area, etc.
Apartment was spacious and open for a city apartment in this price range. The patio was a great way to still spend time in Rome outdoors when you want to get away from the crowds for a bit. I would highly recommend it and would stay there again without question.