Amsterdam Prive is, or was, a private brothel at Overtoom 443. I found the references to this place from Google searches and older posts on another forum.

I found the address, but there didn't appear to be a brothel there. If there was, they didn't do a good job of notifying potential customers that they were there. There was no sign out front or on the buzzer. They also used to have a website, but upon visiting you just receive a message stating that the site is suspended.

I posted this to save others the time of visiting should they find out about the place like I did and happen to do research here as well. On the other hand, if they are still there and just try to be really discrete and someone happens to know they're still in operation, they can post the update here.