Hi Jenny,
wonderful city you're moving to! I live in Amsterdam. I know a few good yoga studios, but it depends of course what are you looking for. Do you have any preferences? Do you have already an address in Amsterdam? My favourite school is of course where my teacher's program is. The lessons are given in Dutch but my teacher always takes care that English speaking people understand as well. The web site of this school is :
Amsterdam Yoga Centre
Than I can recommend also two other studios where the lessons are given in English:
Yoga Amsterdam - Svahayoga; Ashtanga Vinyasa, Vinyasa Krama, Hatha, Iyengar, Pranayama, Meditation, Satsang, Kirtan, Workshops
yogayoga.nl
And we have also Iyengar Yoga Center in Amsterdam if that is your preference. And many, many others, so no worries that you wouldn't find something for yourself. It is a vibrant city!
Let me know if you need any help when you arrive.
Friendly greetings,
Mirjana