If you choose to spend your vacation at a 4-star hotel in Vienna, you'll typically find loads of conveniences to make sure you're relaxed, such as a gym, restaurant and pool. You can look forward to top-quality service and upscale accommodations. Opt for a 5-star hotel and you'll get a few extra bells and whistles — think on-site spas, around-the-clock concierge and opulent turndown services. You're likely to get additional amenities and premium services at a 5-star retreat, but both are great options for luxury travelers.