@Mari79
It's really a matter of preference BUT as a host who has more long term guests (than short term), I would suggest weekly or bi-weekly sheet change and an quick vaccum+tidy up. It is a way to check if your guests are abiding by your house rules in a natural way~ 🙂 but make sure you inform your guests about this in advance and clarify what is included in the weekly clean up vs. what the guest is responsible for.
Personally, I handle sheet changes and laundry of sheets and towels for guests because I don't want them ruined due to improper washings or misuse. I include in my description that host may enter the guest room to change sheets and vaccum or to open or close windows as needed. And my nightly cost takes all of this into consideration.
I haven't had any complaints about regular cleaning yet and my guests have never taken advantage of my regular housekeeping activities. Clear comminication to make sure expectations are managed will be important.
Good luck!