We had a fantastic experience at Principessa Trevi. Very close to the fountain (very central location for Rome's sightseeing) and very quiet despite its proximity to the hussle and bustle. Very clean and well appointed with an air conditioner in every room.
The owner lives in the same building and so is accessible should you need anything but equally respectfully absent at all other times.
Extraordinarily helpful with airport transfers, maps and general information.
All up, fantastic value for money considering Rome's eye watering accommodation costs in summer! Thank you Sara and Giorgia!