Are you creating a list or discussing each one separately? If you are creating a list, I would simply say something like: The following services are available for an addition fee/charge: Dry cleaning services Valet parking High speed internet access In-suite refrigerator Roll-away bed You could say either (additional fee) or (service charge) -- these are equivalent. However, I would not say "additional fee may apply" unless there are cases where there are no fees for this service.
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