In Kotaniishi, a hotel must provide a certain amount of upscale features to earn a 5-star rating. These can include saunas and spas, on-site gyms, gourmet restaurants, complimentary luxury toiletries, premium bedding and more. What also sets 5-star hotels apart is their superior standard of service. You'll enjoy things like concierge services, nightly turn-down services and in-room massage. Some may even offer additional touches like welcome gifts.