It's a simple rule: when the card says "DO NOT DISTURB", simply do not attempt to enter the room. Do not knock. Do not inquire. Do not linger about the door frame wondering if the person inside wishes a final chocolate on the pillow before bed. Just GO THE FUCK AWAY.

As far as I have been able to tell, the following simple axiom holds true at the Tel Aviv Crown Plaza Hotel:

"Do not disturb" card hanging on doorknob = Nothing hanging on doorknob

The funny thing is, back when I wasn't putting the card out, they appeared to enter the room once a day and replace the towels.

Now that I'm putting the card out, they enter the room TWICE a day, rearrange my clothes, knock an additional time at a time carefully calculated to always coincide with my naps, and also steal my soap.

The only nice thing I can say is that this may be the only place in the world you can go where the hotel maids speak english. But it's small consolation.