Hi Aristide and Carolin,
Yesterday I was looking for shapefiles for the various NUTS levels for Apeldoorn and I found datasets as:
https://www.pdok.nl/downloads/-/article/bestuurlijke-grenzen#7d4d65faaa47d99495f87bb77392f833 or https://www.pdok.nl/introductie/-/article/cbs-gebiedsindelingen. Although I can open these files in QGIS and they look like very nice maps and detailed, they aren't shapefiles and I also cannot make shapefiles from them. Also for layer 1.6 Land use (a bit ahead but same question), on PDOK there is also data but all seem to be embedded in different file type or a geoservice (WMS or WFS) which is not the shapefile you asked for. Is it also okay to use these type of datasets or do you have a suggestion for how to deal with this?