Let's enjoy the FREE admission (every first wednesday of the month) to the Bröhan Museum. I have never been and I am looking forward to see its Art Nouveau, Art Deco and Functionalism collection.
I suggest to meet at 15:30 at the entrance but as it's not a guided tour, if you came later you can simply enter and look for a group of people!
Address: Schloßstraße 1a (opposite the Charlottenburg palace)
Website: http://www.broehan-museum.de

UPDATE: Sorry but for working reasons I CANNOT come at the museum with you this time. In any case, I am sure you will enjoy it even without me! Have a nice cultural hour!