We didn't get to meet Alin, but his flatmate, Emilio, let us in and showed us around the (huge and beautiful) apartment.
The flat is located in an incredibly nice part of town, just around the corner from a metro station - so getting around was really easy. Alin also provided super thorough details on how to find the flat.
The room we stayed in was HUGE and beautiful and had the most comfortable bed I've ever slept in.
Highly, highly recommend staying here if you're in Brussels. :)