@Lizandra5 Some hosts advise making it clear in your listing that you go in once a week to do a quick clean and change out bedding and towels. If you decide to do this, don't let it be a "choice"- it's just the way you run your business and if they don't like it, they can book elsewhere. 20-30 minutes should be sufficient- you're not doing a total clean, just a quickie.
Of course, you have to arrange a time to do this which fits your schedule and doesn't inconvenience the guest. Don't mess around with or move the guest's belongings, just attend to anything cleaning-wise that needs attention.
This can alleviate your worry and also lead guests to respect the space, as they know you'll be coming in once a week. If you encounter a guest who you can see is really clean and tidy, you can always ask them if they'd prefer that you didn't come to clean, and if you see that they are total pigs who are actually damaging things, you could get the rest of their stay cancelled if you think that's warranted.