I had this happend to me in Quebec. I recieved a letter from the tourist bureau that I had to conform to the law if I rented my house for less than 28 days. That meant I needed proof of permission from my municipality, insurance for liability $2million, proof of ownership or a lease, and yearly inspection/fees plus payment of the lodging tax. Airbnb does not get involved. It is up to you, I think, to get legal. I did all that was required and am now legal. No more worries, but there are a lot of hosts in Quebec who seem to be running under the wire, for now anyway.