If you decide to spend your vacation at a 4-star hotel in Lisbon, you'll usually find plenty of conveniences to make sure you're comfortable, such as a gym, restaurant and pool. You can enjoy top-quality service and upmarket accommodations. Pick a 5-star hotel and you'll get a few extra bells and whistles — think on-site spas, around-the-clock concierge and indulgent turndown services. You'll most likely get additional amenities and first-rate services at a 5-star retreat, though both are terrific options for luxury guests.