@Mukhtiar0 Please be sure to read the articles in the Help Center about cancellations to get a better understanding, but to your question, yes the guest can cancell without a reason. Cancellation and refund is handled by Air BNB according to your cancellation policy. Yes the guest will be able to review if the cancellation is within 24 hours of check in time. It is a stupid rule but you will have a chance to give a public response if the review is inaccurate.