Some people have already asked. Here are some cool options to sleep not that far away : 

* Youth Hostel - very classy hostel - 5 minutes walk and pretty affordable

* Hotel De Foetz

* Hotel Stand-Inn

* hotel ibis belval

 

Or maybe Camping since the weather doesn'l look too shabby :

* Camping Gaalgebierg

* Camping Kockelscheuer