Hi there,
I recently had a similar experience, where a guest that was staying repeatedly and negatively impacted on other guests’ stays (I ABB three out of four rooms in my four-bed home). I had considered simply not leaving a review in order to not make things awkward, but ultimately I felt that I had an obligation to other hosts as much as I do to my guests.
I did my best to pass comment on positive interactions to provide balance and describe the negative behaviours in a factual way with a focus on impact so that it wasn’t personal, e.g. “I received complaints from other guests about personal hygiene because their stay was made unpleasant and potentially gives me negative reviews” rather than saying, “He smelled so bad you could smell him in the living room when he opened his bedroom door.”
I also tried to leave an explaination in the private feedback so they found the review constructive e.g. “It’s important to hosts that you reply to messages so they know you have received and understood the contents”. And so on.
not sure if I could have done anything else?