When you enter via Amsterdam you just follow the signs Haarlem, Heemstede, Zandvoort.
As soon as you enter Zandvoort ,at the first crossroad you take a right into the
Kostverlorenstraat then you take the 4th left into the koninginneweg and then no 43.
When you take the route Haarlem, Overveen, Zandvoort, then you will drive along the coastline, at the first roundabout you go strait ahead ,then at the end of the road you go along with the road to the left, and then at the end to the right ,then the first left ,then the the 5th road to the right into the koninginneweg no 43.

Map of Zandvoort (push here)