this is a pretty popular site, i see that izabely ferraz is in town.  I don't know if it's THE izabelly ferraz but if it is.... you can see her videos online

http://en.distintas.net/catalogue/Netherlands

In case you strike out with the agencies, there is a TS "area" in the red light district which is within walking distance from the centraal train station.  Just ask anyone where the RLD is - then look for a street called the "Bloedstraat".  Usually there are about 5 to 10 TSs working the windows there depending on time of day and pedestrian traffic.  As with the female window workers, timing is everything.  Some days you wouldn't touch what's available and other days there are 2 to 4 TS hotties in the windows.  Expect to pay 50 Euros for a quick session - more Euros gets you more time (and more service).  If you find one you like you can always offer her more Euro to come back to your hotel room.  Good Luck and report back when you return!