Checked today. In the building at 24, the ground floor is Bunte Schoko Welt, the first floor (accessible via Schoko Welt) is the Ritter Sport Museum. There are a number of other offices signposted for upper floors (Philips, IBM among others), including "Digital Business Factory / consulting for digital transformation" and "Smart Mobile Factory / mobile full service agentur" in the same font/style one under each other. But no Wechselstube/foreign exchange to be seen, and nothing with name ending in "Test" for that matter.

I would say http://www.openstreetmap.org/node/3757059325 is about right except shop=computer is wrong. http://www.openstreetmap.org/node/4724120189 should be deleted.