First of all, I actually lived in Rome for a year so I know my way around it. That's why I choose Blu Tango Guest House to begin with, I know where it's located and I love the Monti area. Despite being in a crowded and lively area of Rome, the room faced an internal courtyard and there was no noise coming from outside which, believe me, it's not that easy to find in Rome!
As I said, location is great. 3 minutes walking distance from Cavour metro station or 6-7 minutes walking to Via Nazionale and all its connections. The area is full of restaurants, bars, small boutiques etc. The room was clean, big and nicely decorated, with a very comfortable bed and a massive mirror in the bathroom.
I met Fausto very briefly, just for the check in, but he seemed a very friendly guy. I'd go back there anytime.