In Vienna, a hotel is required to offer a certain amount of high-end amenities to earn a 5-star rating. These may include gourmet restaurants, saunas and spas, on-site gyms, complimentary luxury toiletries, premium bedding and more. What also sets 5-star hotels apart is their superior service. You can look forward to things like concierge services, nightly turn-down services and in-room massage. Some may even offer extra touches such as welcome gifts.