Took our two year old to play here and he loved it. Started in the mini area, but it did not took long before he was climbing about the main playing area.
Everything was clean, staff at the entrance were friendly. Staff in the restaurant area and waiting tables, were definitely working their dream job as they weren't the most friendly people around. But hey, you come here to play with your kids. Not to enjoy top notch service (good luck with finding that in most of the restaurants in Amsterdam anyway!).
Toilets were very clean and there were tons and tons of things to do for children. We manage to exhaust ours as he almost fell a sleep in the paying area, so mission succeeded!