I picked the Hotel Rex because the map showed that is close to the Termini Station, and, reviewers said that the rooms were big for the standards.
I'm glad I stayed in this hotel, all the staff is knowledgeable and caring (thank you), and every place is easy to visit from there. The fact that it's on a side street was a plus...quite nights.
The location is very convenient, lots of good restaurants, shops and caffes close by, as well as walking distance to bus stops, or train, or metro, or taxis, and meeting point for the tour trolleys.
I would definently stay there again