Unable to answer "What’s the surface here?" – Foot Path – https://osm.org/way/1014883131 via StreetComplete 57.1:

Path is a paving stone one, but there it has no L "kink". The orthogonal to the left path is a service access path for the building (goes all the way to the building (photo 2). 

Also, light is out of the position - move to the right side of the path (it's positioned left of the main street path, should be right).

Attached photo(s):
https://westnordost.de/p/239096.jpg
https://westnordost.de/p/239097.jpg