Mauro's place is great! We spent 5 days there and loved it. The apartment is spacious, well equipped and very cool with all the artwork. We didn't use the rooftop terrace because of the weather, but I imagine in the summer it's the perfect spot to chill out.
The location is perfect as well, easily walkable (or a short taxi ride) to everything you'd want to do in Rome, but private enough that it's quiet when you want it to be (well, as quiet as can be in a big city!).
Mauro himself is an excellent host, he met us when we arrived, helping us park the car and then gave us a tour of the apartment before later giving us a full list of his recommendations for just about everything in the city. He also met us for checkout as well. He's a very friendly guy and always replied to any messages sent.
I would definitely stay here again next time I'm in Rome!