Depending on the cancellation policy i believe the host needs to put up extra money on top of the refund and Airbnb will assist you in finding other accommodation is that not the case?
@Andrew3433 As long as you didn't cancel then what should have happened was that the host would be fined and the dates blocked in their calendar. It sounds like this hasn't happened though. What should happen next is that under the guest's version of Aircover Airbnb should find you replacement accommodation. Sadly Aircover for guest's is cleverly written as it says they will find you replacement accommodation or refund your money. This makes it worthless as a refund is required by law.