Hi @Fríður4 ,
No need to submit a review on your part given that the guest didn't check in to your property. In cases that the guest leave a review, just communicate with Airbnb and tell them that the guest didn't actually check in to your listing.
You may also include "To maintain the integrity of the feedback on the platform and ensure that all reviews accurately reflect genuine guest experiences, I kindly request the removal of this review from my listing as per your policy:
https://www.airbnb.com/help/article/2673#section-heading-2-0
Reviews should be relevant If a guest never arrived for their stay or Experience, or had to cancel due to circumstances unrelated to that stay or Experience, their review may be removed."
I hope this helps.
All the best,
Upfish Management