The location is about 10 minutes from Piazzale Roma, but you should ask Guido for directions ahead of time. And if you are looking for a quiet nights rest, this is not the place. People get pretty rowdy downstairs and keep partying until about 3am; this is a great place if you also want to stay out late though as you are right in the heart of the action.
Overall it was a great stay; Guido is nice and respectful and did his best to make sure we had everything we needed.