To avoid double bookings, it is very important that you book your own stay through your owner login portal. You can easily book a stay using the ‘Reserve’ button. 
You have the freedom to use your own property as much as you want – after all, you’re the owner. Welcome in doesn’t operate a maximum stay and/or period in which you can use your holiday home. But, please let us know in advance if you’re planning to stay for more, or less than, 89 nights, because it affects the type of tax the municipality levies. More information can be found here.