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Piano practice rooms in Brussels
http://www.hanlet.be/showroom.lasso?Lang=UK&ShowPics=no
This place, Hanlet, is just off Chee de Charleroi. I did the same thing some years ago when I came to Brussels. It's not ideal as it only opens during office hours...I used to go down during lunch or sometimes on Saturdays. And you have to book in advance. But, it's only €4 per hour!