I stayed at B&B 830 during five nights with friends. The rooms are equipped with everything you need, are clean and comfortable. The B&B is not in the city center, but right next to the metro station, which is very convenient during the day. The metro stops working quite early at night and taxi is the only option (night busses are not very reliable). For breakfast I suggest to go at a bakery one or two blocks down the street and to try pizza at mangianapoli just a couple of minutes on foot from there.
Conclusion: I suggest this B&B !