@Willene1
Hi Willene, Saying 'NO' to that prompt will not necessarily have a negative impact on the guest, It will mean they will not be able to book with you again but, that won't become public.
If you give the guest an overall rating of less than 3 stars, the guest may be precluded from Instant booking in future if any host has checked the 'Recommendations from other Hosts' field on the 'Booking Settings' section of their listing description.
As far as the review is concerned Willene......be diplomatic! Remember that Airbnb is 'guest centric' and if a guest objects to a review you have given, there is a strong possibility Airbnb will remove it.
The review will say as much about you as it does about the guest, so don't make yourself look like a 'prickly' host....Leave it for a few days before you write your review to give you time to simmer down and see the stay more objectively!....Willene, this is very important!
Make you comments nebulous, but keep within the content guidelines, something like.....
"We try our best to give our guests a great experience, although on this occasion the guest struggled with the information we provide in our listing description. Although I wish XXXXX all the best for the future, I would decline the opportunity to host them again"!
Now, by giving a review like that you have not contravened Airbnb's content policy, you have not been specific about what the guest may have done and you have given no grounds for Airbnb to remove your review.
What you 'have' done though is send a clear signal to the hoisting community that this guest is one to stay clear of!
Mission accomplished!
Cheers........Rob