The yoga classes are not bad, but not top in Berlin, there are studios with teachers that are on a new level. However I’d recommend the outdoor classes in the summer, quite good.
Studio owner Marlena is quite shy, but she loves it when you tell her what to wear before class. She would pretend to resist a little but eventually would give in and come to class properly dressed. Only works if you are a cute boy. As most men in Berlin are super ugly, they most likely will get kicked in the face.