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