The big difference between a 3- and 4-star hotel in Ostrvica is the quality of service and availability of creature comforts. Three-star hotels are typically lower priced and come with the services and amenities you need to be comfortable, such as a gym, WiFi and breakfast. You can expect a little bit more at a 4-star hotel — think upmarket furnishings, deluxe toiletries and extra touches like day spas.