My policy is strict 30% non refundable due upon booking. I have since changed it to 24 hour free cancellation. This way I can touch base with the guest first and make sure they are clear on some house rules and know their expectations.
I called booking.com. If the credit card does not go through the guest can have an option to then bank transfer within 24 hours.
It is 6am in Australia, I will wait and give the guest a few hours to cancel if not I will hit the credit card not valid button to be able to cancel him myself and free up my calendar.
I will also try stripe for credit card acceptance. I was able to see this guests profile on Facebook through a name search so he seems legit. As long as his credit card matches his name I feel it should all work via credit card if he chooses to continue with the listing. Even without the pool he's getting great value for his buck. We are not in a popular tourist area so my goal is to rent ten nights out of a month on average.