The best experience in Budapest is definitely the panorama pool. You can see the Danube and the inner city meanwhile you have a nice bath. The whole place is stunning and affordable!
They're open until 4am on weekends (but stop letting people in at 3 or before). Great nightcap activity; home to the the hottest and coldest pools I've ever been in.
Try the Wellness pass, views from the panorama pool are just awesome, plus the wellness interior pools are really new. You miss the historic part but the views are worth it.
It's is kind of expensive but sauna and swimming pool area are new and clean! Come early so you don't get in the crowd at noon. The outdoor pool is stunning!
Best authentic Spa I visited so far. Over 500 years of history, great value for money and an extremely hot bath for those who want to feel like a boiled chicken.