@Eduard0:
I would include it in the house rules & other things to note. It doesn't hurt to repeat yourself as we know guests don't always read our listings thoroughly. I would separate the check in and check out time into seperate sentences.
Check-in is between 10am - 11pm.
Check-ins after 11pm, must get pre-approved PRIOR to you booking with me since I can't always accommodate later than 11pm.
Check out time is at X time.
On another note, I noticed your check-in time is before your actual check-out time. Does this mean you do not allow back to back guests?