My husband was traveling alone and didn't have a major credit card because he left his wallet at home, the manager approved him being able to check in anyway. I'm very appreciative of this. At the same time, I don't think Airbnb should allow hotels to require a major CC since our a good reputation as travelers should be sufficient. I have been a member of Airbnb for 11 years and have 70 excellent reviews.
My husband said that the person at the front desk was kind and helpful. The general manager was friendly and understanding when he got back to me.