Meanwhile in Sweden, the government instituted a nationwide "Dwelling Units Register", where each apartment etc is uniquely numbered.
There is a precise way to number apartments based on the floor number, order of front doors on each floor etc.
Do you live on a steep hill, and have to go down two floors to reach your apartment which has windows facing out the other side of the building? No problem, the numbering system handles that.
https://www.lantmateriet.se/en/real-property/property-inform...
https://www.lantmateriet.se/globalassets/fastigheter/fastigh...