Me and my wife have visited this termal spa many times. First of all, there's usually no crowds, the pools are extremely well equipped with powerfull water / air jets and we've really enjoyed such mas...
Very pleasant pools with warm water in side as well as outside. Whole battery of water jets and water slide which was adored by the kids. Good rest chairs and cosy little restaurants.
Outdoor pool is not so big, but it is just fine, clean and new. You can sweam inside and use the indoor pool too. Water is very hot inside, so warm-cold water really worked for me.
What do you do in a spa? At least I just lie in different waters and enjoy myself. This is great place for that.
I visited there with my family. All was very nice. Nice for a family city break. Maybe they should add some ammenities for small children.