Unable to answer "Which customers visit this hairdresser?" – on level -1: Roma (Hairdresser) – https://osm.org/way/396140385 via StreetComplete 57.2:

Frisöre (ist ein Frisörbedarf)

Attached photo(s):
https://westnordost.de/p/208857.jpg
https://westnordost.de/p/208858.jpg