I have been hosting pretty intensively for over a year now. I now run two listings at a popular tourist location.
I have just experienced two booking requests that I promptly approved. Yet, the booking did not go through since the guest's CC payment failed. Thereupon, Airbnb gave the guests 24 hrs to attempt to resolve their payment. During this time my property was blocked, i.e., not available for booking.
I messaged the guests via Airbnb and asked them to attempt using a different CC. Never got any reply. Airbnb cancelled their bookings after the 24 hrs period expired with no penalty to me.
I have also noticed that Airbnb allows you to reject their booking if their CC fails, and hence, keep the listing available for bookings without any interruption. I have also written to Airbnb's tech support asking them if such a rejection on the part of the host due to the guest's CC failure carries any penalty to the host. I have not received any reply yet.
I am now going to be rejecting booking attempts with failed CC payments. The guests may be playing foul or not but my listing sits blocked for 24 hrs at the high booking season.
Danny