Their rules pretty much are a copy of USA FAA. No flying over persons, traffic and buildings. If you are flying commercial ( for pay) they require 107 and actual pilots license. I was told this by immigration/customs when I went through Amsterdam. Never did confirm it since I was just flying for pleasure. I tried to stay as close as I could to their rules. Flew mostly in the morning hours when traffic and bikes were minimal. Then tried to stay away from directly overhead. Never had any issues from police which stoped and watched me in the town of Zaanse Schans.
I was flying a Mavic. Traveled with it in a small semi-hard case in my back pack. No problems with customs in USA or EU.
Hint with Mavic: it does NOT do well with low level flight over water. The downward facing sensors seem to have a problem when you are lower that 10feet. Not very consistent with holding altitude. Tried it several times under different lighting conditions. Above 20 ft it worked like a charm.