If you choose to vacation at a 4-star hotel in Danube Island, you'll typically find loads of amenities to keep you comfortable, such as a pool, gym and restaurant. You can experience top-quality service and upscale surroundings. Choose a 5-star hotel and you'll get a few extra bells and whistles — think around-the-clock concierge, on-site spas and indulgent turndown services. You're likely to get more amenities and first-class services at a 5-star retreat, but both are terrific options for luxury travelers.