This is the biggest and most frequented bath in Budapest.
It has more than 15 pools, steam cabin, sauna, massage. Here you will get the full bath experience.
For prices and opening hours check out their website: Széchenyi Bath
Thanks Google, you can take a virtual tour of the bahth.
From Bölcső7 you can get there in as little as 35-45 minutes by public transport: Trip to Széchenyi Bath