Unable to answer "This shop has been vacant. What’s here now?" – Kvarteret Läroverket 1 (City Block) – https://osm.org/way/47663905 via StreetComplete 58.2:

Bostadsrätter

Attached photo(s):
https://westnordost.de/p/228716.jpg
https://westnordost.de/p/228717.jpg