Unable to answer "Is this a one-way street? In which direction?" for https://osm.org/way/3545734 via StreetComplete 53.1:

This looks like a pedestrian only walkway, as it has a temporary bollard and seems to lead to residential and business entrances with no parking.

Attached photo(s):
https://westnordost.de/p/155915.jpg
https://westnordost.de/p/155916.jpg