We stayed for 3 nights n a private room, with private full bathroom, in a separate building just around the corner. Both are very close to Termini railway station - less than 10 min walk.
The gentleman who checked us in (sorry, forgot his name) and took us to our room was amazing.
The room was not big but that was fine with us as we only had carry ons. You could still store one large suitcase with no problem. It was also very clean. The bed and pillows were very comfortable. The shower was clean and spacious, plenty of hot water as well.
The wifi service was excellent in both, our building and the main building where front desk is. The property also has a garden patio with separate wifi - also excellent signal.
If you're looking for a nice, simple, clean place to stay in Rome this is one we would reccommend and definitely go back to.