@Mardy-and-Kate0 Reviews written by either party can be edited up to 48 hours after submitting, as long as the other party hasn't submitted theirs. Once both are written, editing can't be done.
@Mardy-and-Kate0 Reviews can't edited once they are published. Even if a guest contacts Airbnb to say they made an error because, for instance, they meant to click on 5*s and accidentally clicked on 1*, Airbnb won't change it.
A review can be edited for 48 hours after it has been written, but not after it has been published.
What either a host or a guest can do, though, is ask that the review they submitted be deleted entirely.