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Airbnb
http://werk-economie-emploi.brussels/en_US/tourist-accommodation
That it?
Looks like you need to be registered.
Yes, you have to get clearance from the region.
It's a set of regulations specifically designed to discourage people from offering their homes / rooms on AirBnB.
They want to make it financially uneconomic and a pain administratively.
Completely unnecessary red tape, but hey!, that's what we pay our taxes for.
Depends where you live. Flanders is reasonable. Brussels is difficult.