More like 2 star hotel than 3. Standard rooms very small, furnished poorly, old style tv mounted on the wall like a cheap motel. Had to complain in order to change a room but if you order a standard room and they have no other rooms to change you are stuck there for your vacation. very expensive for what it offers.
Cold unfriendly reception staff, cordial but not nice.
Breakfast ok.
Plenty of nicer places in the same area.

My company booked this hotel for business;
The staff are frowny and unhelpful. The rooms were small, claustrophobic and quite unclean. My colleagues got uncomfortable beds and the navigation through the hotel corridors is complicated.

The locationis fantastic - right outside of Trevi Fountain, but even that doesn't make up for the rest.

It wasn't an awful experience - But from a cost-effective POV, I would book a different hotel anyday.

Hi
My wife an I took some time off together for Rome.
We found that This hotel is located at a great place, on minute from trevi fountain , but quiet enough at night.
It is clean and descent. Rooms are small but cosy. Breakfast is Basic and more than sufficient.
price was reasonable.
Great.

Stayed here for 3 nights with my fiancé. I got a room in the 4th floor and I remember when I stepped on the floor, it was kinda move, like the foundation is not that strong. But everything else was OK, means standard.
If you are spending most of the day going around the city, and be in the hotel just to sleep, take shower, store your luggages, and served your belly some breakfast, then this hotel is perfect. Trevi Fountain is just steps away and you can walk to most of the tourist attractions Rome has to offer.
But do not choose this hotel if you want a little extra something something apart from those activities :)