When guests request that you accommodate something which is contrary to your house rules, just say no, sorry. You created those rules for a reason- stick to them and don't let guests try to push you around. Also, guests who start off asking you to make a exception for them generally turn out to be problematic in other ways, as well.
And in spite of Airbnb's feel-good rhetoric about their host guarantee, don't ever assume that Airbnb will cover you for anything. You need your own str insurance.
@Maria13303