I'm Dutch. Before 2014, there was a rule (in theory) that foreigners staying at a non-hotel for more than 3 days had to register. In practice, it was not used. In 2014, this rule was completely eliminated. (There's a registration requirement if you stay more than 90 days as a foreigner, but since visas and visa free access to NL is for maximum 90 days anyway, this rule applies to basically nobody.)

Here's an official source, in Dutch - Google Translate will get the general point across: https://www.politie.nl/themas/kort-verblijf-vreemdelingen-20...