If the store does not occupy the entire building, a point should be added within the building area (preferably near the entrance to the store) and this point should contain information about the store. POI can also be used as a node even when the store occupies the entire building.

Your edit also needs additional proofreading. You have added too much data as the store name:
tag name="VAN THORN Trójmiasto - garnitury szyte na miarę" should be replaced with the following tagging:

name=Van Thorn
strapline=garnitury szyte na miarę

and possibly what you entered as the name can be put into the tag:
description=VAN THORN Trójmiasto - garnitury szyte na miarę

I corrected your edit here:
https://www.openstreetmap.org/changeset/146349315
https://overpass-api.de/achavi/?changeset=146349315