Nothing really. Compared to some/most other B&B's in Rome We had a very decent breakfast. We liked fruit and ham (which wasn't served), so we bought this for a few Euro's in the supermarket, so what's the problem?
Another minor thing: you could not fix the shower head in a certain position.
Location is close to Termini, and walking distance to city center and most landmarks. Very clean. Very friendly staff. Decent breakfast, with coffee, tea, juice, bread, toast, cheese, sweets. Breakfast should be taken to your room, but for us (2 persons) this was perfect. Room was fairly big, as well as the shower. beds were about 2 meters long. Elevator. Fairly quiet (we had a room at the front), you hear some street noise, but no problem at all.