Stayed there in mid-June for 3 nights for only 180 EUR, very good value at that time of the year. Room was spacious and clean with kitchen facilities, the owner was friendly and helpful, he knows Rome inside out. The place is slightly far away from city centre (c. 30min on tram from Termini) and it could be quite difficult to find for the first time as it is inside a large residential complex (your Google map will confuse you), suggest calling the owner for directions before arrival. In the evening the tram is usually very crowded between 6pm and 8:30pm. Overall very good experience staying there, no complain.