In Ciudad Serdán, a hotel is required to offer a certain number of upscale features to earn a 5-star rating. These can include on-site gyms, saunas and spas, gourmet restaurants, premium bedding, complimentary luxury toiletries and more. What also sets 5-star hotels apart is their guest-centric standard of service. You can look forward to things like concierge services, nightly turn-down services and in-room massage. Some may even offer extra touches like a welcome gift.