I would highly recommend Mario and Valeria's apartment. It is centrally located near the Spanish Steps (Piazza di Spagna) however quiet and cozy. The apartment is beautifully decorated and made us feel right at home. Valeria was an excellent host that was amendable to our changing arrival time and greeted us at the door, helped us with our luggage, left us wine and water and also helped us arrange transportation to the airport. I cannot say enough good things about this experience.