I recommend Nerva Accomodation for several reasons (in no particular order):

Location: in the center of Rome, very close to major tourist attractions, in a quiet area with many amenities and restaurants.

Kindness and hospitality: all the staff are incredibly friendly and always willing to help.

Comfort: I was in two different rooms because I made the reservation with no time, and in both was very comfortable. The rooms are just right, the beds are comfortable, the bathrooms are well equipped, air conditioning, ...

Cleaning: the rooms are cleaned every day.