Very great stay! Room and bathroom is exactly as in the pictures. Very clean, and in our stay of 6 nights they came once to change the sheets and towels. There is a small living room to share with the people in the other room. This was not a problem to us, but if the other people get up earlier or come home later you can hear them talking. Sharing works fine as long as you take each other into account and are not bothered too easily.
Luca was very nice, he gave us a map and advised places to eat. We also got tickets for breakfast across the street (one drink and one pastry p.p.).
Location is great, in the monti area, which has a lot of great places to eat and have drinks, not too much tourists. Short walk from termini (8 minutes), so you can walk there with your suitcase. Colloseum and sights in the historic centre are very walkable. Only vatican is a little far, but we took the subway which is also very close. The street of the apartment is quite busy, so there is noise from cars and such passing by. With closed windows it didn't bother us much, we could just sleep through it. But if you're a light sleeper, you might want to bring earplugs.
Overall very great stay, we would come back here!