If you have a long way to travel then the Wellness Kliniek is the perfect location:
Brussels: 50 mins by train
Maastricht: 20 mins by taxi
Aachen: 30 mins by taxi
London: 3 and a half hours by Eurostar / City train
Paris: 2 and a half hours by Thalys / City train
Amsterdam: 2 hours by train to Maastricht
The Wellness Kliniek is located a 5 minute walk from Genk train station.