You've already got a lot of blacks, so it won't be hard to keep the "dark" look. I use Lightroom so may not have the correct Aperture terminology here…
Have you adjusted the exposure at all yet? I would probably start by raising it 0.3 at a time until it looks more like it did to the naked eye (which is, I'm assuming, brighter).
Gave it a shot and this is what I got. It was tough tweak though, 2.3 stops increase, lots of noise reduction, curves and few others. Looking back I should have kept the shutter open a hell of a lot longer.