Unable to answer "What’s the house number of this building?" – House – https://osm.org/way/421128231 via StreetComplete 58.2:

No longer a stand alone house.  This area is in the process of being rebuilt as multi-family appartments

Attached photo(s):
https://westnordost.de/p/229068.jpg
https://westnordost.de/p/229069.jpg