I booked on this B&B, but the room was actually on the "La Residenza dei Principi" B&B, it seems to be the same owners, just a little different location, the B&B its well located, very near to the main tourist places of Roma that can be reached by walk, also many restaurants and grocery stores near.
in a 5th floor with elevator, there are like 4 rooms, one small living room and a kitchen with a coffee machine and a fridge. They bring the breakfast (egg, bread, yogurt, fruit, cake) around 7:30 am that you can take from the kitchen into your room with a tray, During the day there are some things available to eat like bread, milk, juice, yogurt, available on the fridge and a coffee machine for free. I would definitely stay there again.
Room its ok, just the shower its a little small.