We read about it being one if not the most important flea market of AMS but after we saw it I must admit I've seen better and bigger stuff. maybe it's unfair to compare it to other flea markets but this is quite small and not impressive.
It's a market like others and the hype around it (lonely planet guide) is not justified.
Great flea market are others.
If you have time go see it but do not expect something amazing.
If you own or manage Waterlooplein Market, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.