Was in Amsterdam last fall and did enjoy the red light district. If memory serves, I think it was about 60 Euro, for half suck / half fuck, 30 minutes max. The rates are more or less negotiable, if you see a lady you like, ask her how much, tell her thanks and leave. Walk by 5 minutes later and make her a counter offer. Often, you can expect to get a third to half off her original price. However as CapitalGuy says, don't expect it to be a GFE type service. Once you make your deal with the lady, its all business. Best deals are had during the day. Many of the ladies rent their window and the day rent is half of the evening rent. As mentioned above, you can pretty much find any type of lady here, young, old, and pretty much every ethnicity.
Only word of caution boys, avoid the windows with the blue lights. She will be packing something you probably have no interest in!