I would just have a talk to the guests and ask them to move the closet back into their room and to keep their personal belongings in their own private space @Efe96
It doesn't matter what price you set, or how cheap you are, guests should stay in line with your house rules.
Make sure you follow up any conversations on Airbnb with your guest so there is a written record.
If you are getting a lot of problem guests, the review your house rules and how you are vetting your guests.