Rent a room websites, witch one to chose ??? (Amsterdam)

Hi everyone. First of all, i hope i posted this topic in a right category. I'm looking for a room in Amsterdam, i think up to 400e/month. There are a lot of websites, where i can find that kind of rooms, but they're all paid. That's totally fine, but i don't have like 300e for spare to pay for all of those sites.

So i would really appreciate, if you could recommend just one good site, or in Your opinion the best site where i could find a room for myself.