This was annoying, so after some discussion with housemates I turned it around:

In practice this is maybe better, maybe worse, still pretty annoying.

We've considered removing the door:

But this would let kid-noise carry more down to Julia's office, wouldn't work if we had a housemate with a small child or cat, and if at some point the people downstairs were not close friends it would be a little weird.

We could have the door open out instead:

But this would be too awkward to open, since the landing is so small that the door kind of needs to swing through you.

So, it currently still looks like:

One idea is I could cut it down the middle, and let it fold a second time:

This gets it out of the way when it's open, but at the cost of having a really very large swing.

Perhaps the door should open in the middle?

Very narrow for a double door, and it still sticks out a bit on the left. There's extra space on the right, though, so you could make it asymmetrical?

Or, even one door going in and one going out?

This would be a bit more work, but we could put a track on the ceiling that allowed the door to slide around a curve, opening outwards but with a much reduced sweep:

Predictions on what we'd end up liking best?