If you choose to stay at a 4-star hotel in San Francisco, you'll typically find loads of conveniences to keep you comfortable, such as a pool, gym and restaurant. You can enjoy high-quality service and upscale accommodation. Opt for a 5-star hotel and you'll have access to a few more bells and whistles — think around-the-clock concierge, on-site spas and opulent turndown services. You're likely to get extra amenities and first-class services at a 5-star retreat, though both are awesome options for luxury guests.