The biggest difference between a 3- and 4-star hotel in Baltimore is the level of service and availability of creature comforts. Three-star hotels are typically more economical and include the services and conveniences you need to be comfy, such as WiFi, breakfast and a gym. You can count on a little bit more at a 4-star hotel — think upmarket furnishings, deluxe bathroom products and perks like spa and wellness centers.