Trafo Contemporary Arts House is a former electrical transformer station turned contemporary arts venue. It is one of Budapest's better places for experimental theatre, dance, performance, and visual art, with a programme that usually feels more local and risk-taking than the big institutional stages.
The industrial building is part of the appeal: plain, functional, and well suited to work that does not need velvet seats and gilt balconies. Check listings before going, as the best reason to visit is a specific performance or exhibition.