I would highly recommend staying at Casa Trevi Garden. The location is terrific, close to the Trevi Fountain, and a short walk to the Spanish Steps, Pantheon etc. The apartment is in a very quiet, private courtyard with access by two large doors from the street. There are shops and restaurants just outside on the street. The apartment is spacious and comfortable. Marta was an excellent host setting up a taxi to pick us up at the airport and for our return. She was waiting as we arrived for a 10 AM checkin. When I return to Rome, I would definitely stay back at Casa Trevi.