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Haven't seen this one posted yet (and don't have a video... maybe soon)...
Anyway, you can walk into it ... no jumping crouching ... whatever
Starting at the corner of the DoubleTap Machine and the wall (facing the stairs), walk down the wall until you're stopped by the corner.
Turn and walk back against the wall to the DoubleTap Machine.
Turn around.
Any zombies coming up the stairs or through the wall will think you're in the corner by the stairs and will bunch up there.
The nice thing about this is that as long as you stay against the wall, you can walk up and keep reloading your MP40. You can also get the powerups the dead zombies leave. If they see you when you advance, just retreat backwards (AGAINST THE WALL) and shoot them all dead. The new zombies will still bunch in that corner.
If you have at least one guy at the window on the balcony, you can rule and go as far as you want. Even if you're the last guy and everybody else quits, you can turn and kill all the ones coming from the window and then turn and kill all the bunched-up zombies in the corner.
Enjoy!
Walt