At the moment, you will not successfully find a house without paying a realtor. They can view entries into the Funda(1) database before they're publicized. Source: acquaintained photographer who exclusively works for realtors.
(1) Funda.nl is a real estate website that more or less has a monopoly in The Netherlands.
(1) Funda.nl is a real estate website that more or less has a monopoly in The Netherlands.