Unfortunate situation, but the risk always exists for this type of deals. This is also why hotels charge you x3. Do not forget to scan your airbnb for hidden cameras as well.

How do you expect airbnb should handle this situation?

AirCover policy says that they will find a similar place (whatever it means) or do a refund.

To not risk getting homeless, I think you need to always plan in advance for what to do in case expectations are not met with your stay.