Be very careful with KLM, full-stop. I only use them when I absolutely have to, through work & in which case I don't have a choice as one of the PA's will have already booked me on the journey.
Work takes me into most of Europe very regularly and, wherever poss. I use anyone but KLM/BA to get me into any of the main-line airports in Germany. From there, onward travel/connections are a doddle.
I once arrived @ KLM transfer desk from Hamburg en route to Newcastle to find they'd already sold my seat to someone else! No apology, kiss my backside - nothing!
Like I say, be careful. If that's the Royal dutch Airline, God only knows what the royal family put up with!
Advice? Use Lufthansa if yu really want to be looked after - or Aer Lingus/Aer Arran (but then Im biased re: Gods own country!