>What would be the Hamborger Platt pronunciation?

"Raperbahn" as you said.

When I went there, as soon as I emerged from the underground, one of the "fairies" had grabbed my arm and was trying to pull me somewhere. They'll block your path and you literally have to push them out of the way if you want to make progress down the street. (That is, if you visit as a lone gentleman.) Then there's the one alley, with barricades at each end, that non-working women are forbidden to enter. I understood that many were Polish, incidentally. By dawn, I had figured out how to sort of stand so nonchalantly that I wasn't propositioned anymore!

I believe there was one bar, quite close, called "De Hamborger Veermaster."

I listened to a German guy tell me a LONG story in one of the bars, only nodding and smiling as I could guess it was time to nod and smile. He finally ended his spiel and asked, "Right?" I said "Sorry, I don't speak German." He was a little angry! It was an unusual experience for me because I'm used to traveling places where I look different than most of the population, but there they could assume I was local and people kept saying things to me that I could barely understand -- though Platt, like Dutch, is one of the closest languages to English.