I've been here two times with my boyfriend and the kids. We always have such a good time, the kids love all the rides. The staff are very friendly and helpful. If you're here with the family, it is highly recommended to rent the gazebo, so while the kids play on the slides, the grown-ups can just relax.
Had a bit of an unfortunate incident when trying to book the cabana though. I tried to contact the Waterbom staff, got through, and was answered by Adel (the staff name). I asked if we can book a gazebo, and honestly, she was not helpful at all. She said it's all full, and when I asked if we can have a waiting list if there's a gazebo available, Adel said they're all full and the waiting list is already long. Mind you, I asked 2 days in a row, but when I used my boyfriend's number, who is a foreigner, she said there's 1 available right away. Sounds a bit racist from Adel, tbh.
But oh well, the kids had a great time here!