Urben is very nicely located within Rome. It's a very quick walk to Piazza Della Repubblica (and the corresponding subway station) to the northeast, Piazza Venezia and the Campidoglio to the southwest, the Colosseum to the south, and Termini Station to the east. It's tucked away on a back street very close to Via Nazionale, making it accessible to the main attractions of the city while simultaneously quiet enough to get some sleep in.
Gael was very kind and gave us a quick map guide when we arrived. He let us leave our bags at the front desk after we checked out and was there most of the day watching them - we were a little wary of the situation at first, but the building is very secure and we returned later in the day to find our luggage untouched.
The room itself was also quite nice. It has an industrial feel to it but doesn't come across as trying too hard to be cool. The bed is comfy and the private patio is a nice touch (even though we didn't stay long enough to get much use out of it).
Overall, for the price, it's hard to imagine that there are many superior options to stay at in Rome. Great place.