Everything is great. Relatively big room, comfortable bed, extremely easy public transportation, the host Federico was busy during our stay so I didn't get to see him a lot but he offered great flexibility for check-in and check-out, easy to wash/dry my clothes, great shower, great kitchen... and other things are all great.
Two little problems: location is good enough to travel around by train and public transportation, but you may not find a lot of interesting things if you go out for a walk during the night; during the sleeping time Roma is really cool, but during the day and early night the tiny fan/air-conditioner cannot make the room really comfortable.
I will not particularly recommend this housing for people who wants to experience the best of Roma because you could find a better location to walk around and, of course, afford a higher price; I would definitely recommend this place for the budgeted travelers, you can't ask for more at this price.