Since ancient times Croatia has been recognized as a tourist destination with the potential and this potential exploit started and especially in the sphere of summer tourism on the Adriatic coast. In the exploitation of the tourist potential of the leading citizens of the Republic of Croatia who have recognized the opportunity for additional revenue renting out part of their own homes to tourists vacationing on our coast. The increase in the number of renter, there is a need for something that's original, which would be pulled from the others and in this case it's own web sites on which potential buyers are we showing what exactly what we offer. Network application for reservation and rental apartments I decided to do to connect the pleasant with the useful so as to make the final work and friend help in achieving better promotion of private accommodation which offers. The application is created in the ASP.NET technology in language C # in Microsoft Visual Studio 2017. The whole application, is responsive and is made in the framework of the Bootstrap. The corresponding database I created in Microsoft SQL Server Management Studio 17. This network application contains basic information about the apartments that are on it represent, and it contains a system for booking apartments. Reservation system works in the following way: the customer first chooses the desired apartment from the drop-down menu, then choose the period of the reservation and the number of persons who would have stayed in the apartment during that period. In the background checks to see if the desired apartment is busy in the selected period. If the user prints a message about the apartment you busy to pick the second period for the reservation. If it's for the selected term desired apartment free message is printed to the apartment reserved successfully and to the e-mail address of the customer to send the details of your reservation. To use the functionality of the reservation the user must register on the site. After registration, the system recognizes two types of users, customers and administrators. Both have different previews of the pages so customers are not visible to administrative pages. On administrative pages the administrator has an insight into the list of registered users, view and edit their roles, overview of typed booking. In short, say this app is made the promotion of the private accommodation of the owner of the application, and also facilitates the process of booking and managing reservations.