Unable to answer "Is this a one-way street? In which direction?" – Fiskargränd (Residential Road) – https://osm.org/way/77461812 via StreetComplete 58.0:

You can't drive cars here, but you could bike and maybe drive a motorcycle, but it's practically just for pedestrians

Attached photo(s):
https://westnordost.de/p/218950.jpg