I do the cleaning myself, except the few times that I don't. Things that my cleaner has missed, and I might have missed as well:
check the in-suite coffee machine to make sure that there aren't old grinds in there. Ensure that the carafe doesn't have coffee remaining. Clean all the parts!
Empty the electric kettle and leave open so that the drips will dry
distribute the hangars in the closet so that they are equi-distant and make sure that there are no old, wet, dirty towels hanging from them.
vacuum inside the closets
clean all the mirrors, and there should be no streaks, please.
clean out any "stuff" left in the guest fridge and please wipe down the shelves
And this is why, if at all possible, I do the cleaning myself, and I always make sure that I can check the space before the guests arrive.