Hi @Merrily2 Don't worry about it, it just happens sometimes, and some guests (especially new to Airbnb) don't really think about reviews, nothing personal.
I discovered when talking to a neighbour who'd used Airbnb (and other platforms) and she said she never leaves reviews, nothing to do with the experience just never occurred to her to bother - same as she wouldn't bother to leave a review for a hotel.
I'd estimate at least 10% don't leave reviews - I've been hosting for 12 years.