Wolfenstein: The Old Blood

Here is my Walkthrough from the Wulfburg Nightmare Level. After you leave the Wulfsburger Place and unlock the Challenge for that Area, you will arrive the House of Agent Two. This House is unmissable and Story relevant, before you interact with the Door, turn around and go straight back in the Ally, here you find the Bed aka Nightmare level Location.

Here is my personal video of the quickest way from point to point:


And here is the map: