Unable to answer "Who is allowed to park here? Parking may be free or paid." – Parking Lot – https://osm.org/way/475168595 via StreetComplete 58.2:

Opdelt. Parkeringsplads med carporte er privat, den anden er uskiltet

Attached photo(s):
https://westnordost.de/p/232210.jpg
https://westnordost.de/p/232211.jpg