How do you politely ask your vacationers to leave?

[Mindy Jensen]

I am traveling this week and next. I was working in a hotel room yesterday (wow, that sounds bad) and checkout was noon. I ended up leaving at 12:06, not a huge deal, but I can see people still in the room at 12:15, 12:45 or even 2:00. Not cool.

As a vacation renter, I try really hard to be on time with my departure, because that isn't a hotel, they don't have extra rooms, etc. 

We've got a stay coming up at an AirBnB, and just received this note:

Checking out: 10 AM - Our cleaners often come right at 10:00 am, so please be timely with your check-out. We appreciate it!

How do you convey your checkout time with your short term renters? Does it work, did you have issues prior to implementing this language?