What hotel to stay in that's close(walking distance) to the red light district.  3 stars minimum.

Etiquette at the red light district.
How much do the window girls actually cost? And for how long?
What are the rules after you are inside the window?
Where does the negotiation begin? At the door?
Can you haggle over price or everything is set in stone?
Do all the girls charge the same or it varies by quality and looks

PM sent..

http://en.wikipedia.org/wiki/Amsterdam_Red_Light_District

http://www.punterlink.co.uk/escort/escort_directory/europe_cities/amsterdam_escorts.php

Got both of these, from Punterlink, a UK site. Not much help, but some. The article, on red light dist., is good info, if you've never been there(like me).
Good luck, and post a quick report.