If you choose to vacation at a 4-star hotel in London, you'll usually find plenty of conveniences to make sure you're relaxed, such as a gym, restaurant and pool. You can look forward to top-quality service and deluxe accommodations. Pick a 5-star hotel and you'll get a few extra bells and whistles — think on-site spas, concierge assistance and opulent turndown services. You'll most likely get more amenities and first-class services at a 5-star getaway, though both are superb options for luxury travelers.