There's a problem that comes up frequently, where a potential Guest books a room, but does not have a valid form of payment. When this happens, AIRBNB's current policy allows the potential Guest to block the dates of the Host's calendar without offering a good faith payment that complies with the Cancelation Policy. They can hold dates and block up the calendar, right up to the Check-in date, EVEN LATE IN THE DAY WELL AFTER CHECK-IN TIME, and then, suddenly cancel without any consequences. Normally, they should lose their first day's payment and half of the following days, but it's a loophole that can be used to avoid any loss in accordance with the Cancelation Policy. This frequent scenario causes harm to the Host, whose calendar was blocked by the potential Guest without any responsibility or loss. I believe AIRBNB should never accept any reservation without payment, or at least, never do so within the 5-day period immediately before the Check-in time. This would comply with the Cancelation Policy and protect the Hosts from such abuse and harm. I hope they'll consider adjusting the Policy, as such.