you can generally expect to take, depending on the hotel’s policy, may include:
Unused miniature toiletries
Small bars of soap
Disposable shower caps
Complimentary stationery
Pens
Complimentary tea or coffee
Individually packaged consumables
Disposable slippers, when provided as such
Items that should generally remain include:
Towels
Bathrobes
Hair dryers
Irons
Coffee makers
Kettles
Remote controls
Decorative objects
Lamps
Pillows
Blankets
Reusable bathroom dispensers
Artwork
Other hotel equipment and furnishings
This isn’t an absolute universal rule because individual hotels can set their own policies, but it provides a useful starting point.