In Ostsy, a hotel needs to offer a specific level of top-notch amenities to be rated 5 stars. These may include on-site gyms, saunas and spas, gourmet restaurants, premium bedding, luxury toiletries and more. What also sets 5-star hotels apart is their guest-centric service. You'll enjoy things like in-room massages, concierge services and nightly turn-down services. Some may even offer special touches such as welcome gifts.