The “handwritten pictures” part makes me think it may have been some kind of Hinterhöfe (public backyards), maybe “Hackesche Höfe”, https://commons.wikimedia.org/wiki/File:Berlin-Mitte,_die_Hackesche_H%C3%B6fe.jpg ?

https://www.openstreetmap.org/#map=19/52.52473/13.40188 - but the shapes don’t look right.

Maybe you find something by browsing the parent category on commons, https://commons.wikimedia.org/wiki/Category:Courtyards_in_Berlin-Mitte ?