@Thea-Angelie0 Tricky one.
Personally, I don't mind if guests leave clothes & possessions in a mess in their room, so long as there is nothing wet, contaminated, or causing stains. So long as they gather it up & take it away when they leave, that's fine with me. (I find most of my guests live the way you describe!)
The bathroom issues sound minor, or would if it were a private bathroom. What I would do, is tell your guest that another guest will be sharing, & could he start leaving the bathroom as others would wish to find it?
Same with the kitchen, to avoid sounding over-critical, I would ask him to clear up his dishes promptly, "out of consideration for the other guest!"
You are at liberty to terminate the booking if you wish, but from what you describe, I myself would let him stay, after a chat about expectations.