It is up a bunch of flights of Roman (read: 20ft) stairs with no elevator and the person checking you in won’t come down to help.
The place is in the best neighborhood, close to fun bars, the best ancient walks, etc etc.
As an American obsessed with Rome and having spent lots of time there, this is a great place to stay. One of the coolest neighborhoods close to all the hits, comfy, beautiful, truly amazing block to be on and the apartment itself has everything you need.
Just make sure you can handle your own bags and like lots of stairs if you forget something!