What you experienced is a classic Airbnb scam where you book a place, the host cancels when you show up, and then the host tries to get you to go to another property. The host will have you pay them directly so Airbnb doesn't get a cut and they make more money. They're grifting off Airbnb as a funnel for clients to their illegal/shady short term rental. Make sure Airbnb knows you were told to book another property at checkin.