We stayed at this site for the last week of August 2015 and had a brilliant time.  We booked a Comfort Extra pitch and on arrival were directed straight to it by the helpful receptionist.  On arrival we found the pitch was largely bare sand where you'd have the van and awning (understandable at this time of the season on a site admitting tents) but where the grass was, it hadn't been cut and had quite a few nettles growing.  The dedicated water tap was shared with the next pitch but the connection wasn't a standard UK type so the mains connection wouldn't have worked in any case (also the tap was a push in type which was a bit awkward).  Biggest potential problem was the 6A electrics and 1300W limit; we blew the electric twice on arrival but, strangely, our 2kW kettle only caused one other trip all week! The sanitary facilities are spacious, never crowded and were always clean.  So overall the camping facilities are not perfect but good enough. If you have kids, though, the pool and park are phenomenal.  I'll not give any detail here - there are plenty reviews out there for you to see what's on offer, but will say that there was a good mix mix for all ages and tastes.   On top of these, you have the location - good for the beach (though we didn't sample this), Wassenaar (lovely little town), easy access to Amsterdam and the Hague.  Both were impressive and worth the visit.