Oh Mateusz, you could quickly answer your questions yourself:
chinaware is the English word for the German ‘Porzellan’ or the Polish ‘porcelana’.
Of course it's a shop - a quick internet search for Porzellanhaus Schäfer: https://www.kueche-und-tisch.de/ (the name is probably (now) a bit different).
correct OSM.tagging would be: shop=pottery