We ended up here instead of one of the larger baths because I wanted to experience these tubs as they were designed 100s of years ago. The renovation up front created a little havoc getting into the building but after that didn't cause any issues. The tubs were clean and not overcrowded even through they were running out of lockers (Sunday at 6pm).
We only went for the Thermal Section and rented towels (actually bed sheets). It was co-ed day and there was no nudity minus one lady and her boyfriend who decided to put on a little naked show it seemed. Most of the women were in 2 pc suits and the men were in trunks.
I suggest checking out all of the tub temps and pushing yourself into the 72° C sauna. it was pretty darn hot.