Unable to answer "Do you need to pay to enter here?" – Digital Game Museum (Museum) – https://osm.org/node/2699645311 via StreetComplete 58.0:

This area is fenced off. So I don't think there's a museum here. Looks like they're going to build apartments here soon.

Attached photo(s):
https://westnordost.de/p/221829.jpg