Anna's B&B is nice, cosy, clean and very close to the center. It is just 10 minutes away from Colloseum. Breakfast is good and stuff friendly. Even thought Anna does not speak english very well, she tries a lot.
I recommand the place, but read carefully all the description of the B&B in order to assure that you are confortable with all the house rules and for proper planning. Some rules are very strict and very specific only to this B&B like extra tax if you arrive after 12 midday, no possibility to leave your luggage after check-out, check out at 10 AM.