I've been hosting for a long time and had a chance to deal with this scenario many times. You are left with a choice between refunding a guest for something that has nothing to do with you, or the possibility of getting a subpar review. I agree that, logically, you're not responsible. But economically I've determined that it's almost always better to give the refund, so ask for a 5 star review, and keep people happy.
Airbnb as a source of revenue is an extremely profitable compared to long term rentals, you need to do anything to keep them happy and keep that stream of revenue going. Better reviews also result in higher prices per night. I've tried taking the moral high ground and it doesn't help your bottom line if you're doing this long term. If you can afford to refund one night and maintain the peace and keep the business going (assuming you have stellar reviews) then I would consider that.
Airbnb as a source of revenue is an extremely profitable compared to long term rentals, you need to do anything to keep them happy and keep that stream of revenue going. Better reviews also result in higher prices per night. I've tried taking the moral high ground and it doesn't help your bottom line if you're doing this long term. If you can afford to refund one night and maintain the peace and keep the business going (assuming you have stellar reviews) then I would consider that.
"Are you not entertained?? 
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