I stayed at Mugiko's place, for 2 nights in December. Mugiko's place, as already mentioned, is close to the metro station (literally on the doorstep). There is also a grocery shop nearby in case of some emergency supplies and also lots of restaurants . Most of the famous places are easily accessible by the metro or even by bus.
The room itself is a bit small but definitely enough for a single person. If you are not staying in the room (if you came to explore Rome as a tourist), I would say it is a perfect place to stay. The place is clean, and you have a private toilet next to your room. The towels are washed. There is also a small fridge in the room. Some downsides are the elevator is really old and narrow (starts from the first floor and you need to open and close them manually, it could be a small problem in case you have very heavy luggage). Although there is a kitchen, I found that there were not enough utensils to use so I didn't use it except for the water- boiler.