Foto Jansen sucks IMHO. The owner is a grumpy old fart, is very opiniated, and his prices are sky high. IIRC he has a Canon 7 (or P?) in the window for 1100 euro. I can't shake the feeling that's a bit outrageous. The Rolleis, 'cords, etc are also rather high priced. And yes, the store itself seems to have been stuck in a time warp, not having changed a bit since a decade or more. 🙂
There 2 or 3 shops near OLVG:
Foto-Cine NIVO - Eerste Oosterparkstraat 121
Foto Fransen - Beukenweg 31
Peeters' Foto Cine - Eerste van Swindenstraat 41
I don't know if the first and last still exist. Foto Fransen is still in business, though. IIRC, Peeters' is a small shop with a ton of things to rummage through, at least that was the case several years ago. At that same day, Foto-Cine Nivo was closed, and I haven't been back to check on either shop since.
Check out the two stores (one for pros, the other for amateurs) at Parnassusweg 204. Right across the street is a newly opened Märklin store, in case you're into model trains. 🙂
At the corner of Zeilstraat/Amstelveenseweg is a small shop that looks like a regular digicam selling shop but they also have some second hand manual focus lenses and such.
The shop Foto Professional at Nieuwendijk 113 is always fun to walk into but I've never bought anything there. I can get my stuff cheaper from Stephen Gandy or elsewhere on the internet. 🙂
But this is all camera stuff, no darkroom. For darkroom you're pretty much limited to Foto Nivo at Haarlemmerdijk 114.