Airbnb will not refund you a stay unless your flight has been cancelled by the airline. Unfortunately the airlines are giving options right now, Delta for example let's you rebook or get refunds to some countries that are trying to shut down this virus at it's source. But not feeling safe, along with being given a refund on a nonrefundable ticket does not matter to Airbnb at all. My recommendation is if you have to travel in the next three months to somewhere in Asia or the Mediterranean is to make sure your booking is fully refundable or get in contact with your host prior to booking and see how leniant they are.
If you thought you could get trip insurance to cover the risk you are also going to be in trouble. Your trip insurance will not cover pandemics, read the fine print.