To book please use the booking form.
If you do not want to re-enter every time you can save your data. In the future, you can register directly on the site and access your data prefilled. All you have to do then is enter the dates of your stay and submit the reservation.
For the data storage see at the end of the booking form.
If you have selected the data, you will automatically be sent an email with your personal user account (user name and password) - these passwords you need for the application. Changes, such as a new address or phone number, are under my data.