The location is incredible, right in the middle of all the restaurants and bars, walking distance from public transportation and the (historical) city centre.
The rooftop terrace is an awesome addition, especially for smokers.
Noise was minimal, which is remarkable given the liveliness of the neighborhood.
The bed and pillows were decent, and I didn't mind the flights of stairs (I travel light).
The only letdown is the shower's low water pressure and the time it takes for the hot water to arrive. I didn't mind too much, given all the wonderful aspects listed above, and I also have short hair.
I'm pretty sure I would stay here again if I'm ever back in Rome.
PS: Be mindful not to accidentally turn off the boiler. Its switch is located next to the light switch.