In Kulm, a hotel must provide a certain amount of high-end amenities to be designated 5 stars. These can include on-site gyms, saunas and spas, gourmet restaurants, premium bedding, luxury bathroom products and more. What also sets 5-star hotels apart is their exceptional service. You can expect things like nightly turn-down services, in-room massages and concierge services. Some may even offer additional touches like a welcome gift.