We didn't know what to expect with this gem, but it was a perfect space to stay for us. It's located right by the Vatican (same Metro stop, about 5 minutes walking) but in a fairly residential neighborhood. It's both right where you want to be and a little bit quieter. You are 10 ft from the Metro station on the orange line, which is 4 quick stops from the Central Station and everything else you want to see (besides the Vatican) in Rome.
Giordani makes a nice simple continental breakfast with fresh warm croissants and toast, coffee and juice. It's lovely.
The place is suuuper clean and private. We had a lovely stay.