In Kertosono, a hotel is required to offer a specific number of top-notch amenities to earn 5 stars. These can include saunas and spas, on-site gyms, gourmet restaurants, premium bedding, luxury bathroom products and more. What also sets 5-star hotels apart is their outstanding standard of service. You can expect things like in-room massages, nightly turn-down services and concierge services. Some may also offer thoughtful touches such as a welcome gift.