Keep track of small items, or they might get thrown out
We had a few small items disappear during our stay - a pants hanger for my husband's tux, a cover for my toothbrush, etc. My best guess is that they were inadvertently thrown out during cleaning. The hotel's response when we mentioned this was far less than satisfactory - would you like us to look out for them? Obviously, these were small, not very expensive items, and we will just replace them; the larger point that the hotel missed was that their cleaning staff isn't very careful. This fits with my discovery of an opened bottle of conditioner sitting on top of the shower frame when we arrived - whoever had cleaned the bathroom hadn't bothered to step back and do a last look to make sure that everything was clean. Finally, be prepared for the cleaning folks to come knock on your door - or make lots of noise outside your door, if you remembered to put up the "do not disturb" sign - at 9am.