Is this a scam?

Hi everyone, this summer I'll be moving to the Netherlands for an internship, and thus I'm looking for a flat to rent. I've encountered an offer for a single-bedroom apartment in the Hague for 500€ (seems quite cheap?). But I've been asked to pay a fee for submitting a registration form for approval. Is that a thing or is it a scam? The offer seems a little too good to be true, but then I have no idea how housing market in the Netherlands works. I'd really appreciate your help!