A lightweight (aluminium) key ring / bottle opener, some sticky notes and some page markers from the Novotel Leuven Centrum. Oh, and a couple of boiled sweets

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This isn't a gift I'd want to receive again and again, but it's actually nicer and more useful than the sad plates of 'sweet treats' often encountered in hotels higher in the Accor pecking order.
i would suggest Accor this keychain