In the 4 building, south of the gate is a combined gallery and artist studio named "Studio 4". 

This is a bit confusing, because there is https://www.studio4berlin.com/ which is a DIFFERENT space. 

The website of this "artist space" apparently used to be https://ciccaboom.com/tag/artist-space/ where it is called "Studio 4", with this address. Last website entry is in Spring 2022, but the "artist space" is still there, walked past it yesterday, and there is a "Studio 4" sign in the window.