We had a fantastic stay in this lovely apartment -plenty of space for 4 adults and 2 children, an excellent location with easy access by bus from Termini station (it is also very walkable - we walked from the apartment through the Villa Borghese and to the Spanish steps and Trevi Fountain (and back again) with 2 kids under 6).
Some great restaurants nearby too.
Above all Dario was a superb host - his responses to emails were almost immediate and he was so helpful with information and arranging a very efficient airport transfer.