In Princeton, a hotel must offer a certain amount of upscale features to be rated 5 stars. These can include on-site gyms, gourmet restaurants, saunas and spas, premium bedding, luxury toiletries and more. What also sets 5-star hotels apart is their outstanding service. You can look forward to things like concierge services, nightly turn-down services and in-room massage. Some may even offer extra touches like welcome gifts.