Information systems in the 21st century are an indispensable tool in the business of a hotel organization. Investing in new technological solutions in the hotel industry is becoming the foundation and prerequisite for success and creating a competitive advantage. Everyday changes in the tourism market, including changes in external business conditions, stricter economic criteria and increasing competition, the need for integrated business and a modern costing system tend to implement the best possible information system. Quality and accurate information in business today is becoming the most important management resource and result in quality and timely decisions and ultimately a better financial result. The basis for obtaining quality and accurate information and its storage and adequate use in the hotel business is a quality IT subsystem integrated into the hotel organization. The hotel information system helps the hotel organization to communicate inside and outside the organization. In order for the selection of the information system to be integrated into the hotel organization to be satisfactory, it is necessary that the management of all levels participates in the initialization and parameterization of the IT solution. Hotel management must be familiar with the possibilities provided by the information system and constantly make clear and structured requirements for its improvement and development. Also, after the introduction of the same, it is crucial for good results to get used to the staff and acquaint them with the advantages and possibilities of using the information system. Hotel Istra - Neptun in the public institution Brijuni uses a modular software solution MisH - Modular Hotel Information System, which as such has proven to be an excellent solution for hotel needs, enabling data generated in the process of providing all services in the business of two hotels through the appropriate, customized module. stored in a database and then be accessed through the same or another appropriate module. Such an application program consists of several program modules that are connected by common master data and business rules. In this way, the hotel management has an insight into the entire business for better control and timely decision-making, and employees in their positions can easily fulfill all their tasks, thus obtaining all the necessary information related to guests and business.