@Hellen8, @Rachel177, yes, Rachel has suggested what I consider the code for a challenging guest without explicitly saying so. I've only done it a couple of times, but it goes something along the lines of "X was a guest over a weekend in February." Other hosts will be able to read between the lines. Then give them the thumbs down.
For a long time I was under the impression that one had to choose thumbs up or thumbs down. I learned here in the CC that another option is neither up or down. It taught me to look for the indication "this guest is recommended by x hosts."
I made a resolution to leave more honest reviews for people in a nice way going forward. If someone isn't instant booking their property they won't see the star ratings. So glossing over in the written review and relying on the stars alone isn't going to help everyone.
Good luck Hellen!