Mariano's apartment was our first b&b experience and I can honestly say it was awesome. Mariano himself was a very intelligent and personable host who greeted us as soon as we got there. He was extremely friendly and helpful and offered us all sorts of insight into visiting Brussels.
The apartment itself was extremely clean and tidy, and very spacious. It also has pretty much anything you would need for a stay.
As far as the location of the apartment, it's in a nice quiet neighbourhood that's within walking distance of transit although you can easily walk to most major touristy spots or the centre.
All in all our stay there was fantastic and I wouldn't hesitate to stay there again in the future. I highly recommend it to others!