Dutch people have a beautiful and well maintained indoor ski village at Landgraf, it is one of the largest one in Europe.
They have 5 slopes; two long ones, one fun park and two small ones for beginners.
If you are a pretty advanced skier you might get bored but when you go with friends it’s a lot of fun.
There is a little cabin in the middle if the slopes for drinks and just below the slopes there is a restaurant with good selection of food. I ate a nice plate of linguini bolognese and it was pretty good.
Overall Landgraaf is a good place for everyone and is a nice warm up before going to the real mountains.