It's a rather odd place, but good fun and would certainly make for a memorable trip. It's in an old aircraft hangar, and though not as swish as it looks in its photos, there is a lot of space and there are many options to choose from. The children there were having a whale of a time, and several people were staying overnight in the cabins. We didn't do that, but it looked like it could be fun for a night or so.
I haven't driven there before but have been on public transport (train and shuttle bus, took about an hour altogether from Berlin). It's in the heart of the old DDR and a very interesting landscape. (The Spreewald is where the mother wanted to have gherkins sourced from in Goodbye Lenin, if you've ever seen that!)
As for the PP's concern about nudity, it does the standard German thing of having areas where swimming costumes are to be worn, and other areas the sauna and the spa/pools around it where they are not allowed. You would easily be able to avoid the nude areas if you wanted to, but if you were to decide to go to the sauna you would find people did not bat an eyelid (nudity is more normalised there).
Tiny tip: if you have a phobia of insects, be aware that there are a few beetles and insects which are there to help the ecosystem and limit the number of chemicals required. You would not come across them much and might not even notice any, but just thought it was worth a mention...