@Jason469 Airbnb added the ability to leave a review as long as the cancellation was done on the day of arrival or later.
This was added to handle the situation where a guest would arrive at a listing and find it wholly unacceptable. In the past, the guest would cancel and be relocated, but would be unable to leave a review to warn other guests.
Airbnb therefore added the ability to leave a review if the cancellation was day of arrival, just so that people could leave reviews when things did not work out.
Hopefully this guest will restrict their review to the issues of communication, as they did not experience any other part of the listing. (Going further than that might be grounds for removal of the guest's review.)
For your own review, it is always good to keep host reviews as factual, accurate, and brief as possible, much like a newspaper story. For example, in this case one might write:
"The guest arrived one night earlier than the beginning of their reservation at 1 am. The guest claimed they attempted to call the host about the early arrival, but did not speak to the host about the early arrival and did not receive permission for an early check-in. The reservation was cancelled by the guest with an accompanying request for a full refund."
This recitation of the facts of the event leaves off speculation as to the guest's motivations, state of mind, and moral character. This helps protect the review from being removed, as it strictly reports verifiable facts.