borked

~5k/m2 is reasonable, but if it's well-place it's a bargain.
The thing is with Paris apts is to see the potential - if it's on the anything >3rd floor without elevator, it sucks. If it has a cave (~6m2) it's a huge plus. If it's on the last floor with roof-space still intact, snap it up.
We bought a 40m2 apt a while back in the 18th, got the permits to break into the unusable roof space and created a mezzanine - pumped up the m2 to 60 and tripled the value in one fail swoop. We made a killing on that tiny apt.

But if you're going to buy in Paris, get a local to give you serious advice, even if you have to pay for it.

--edit and bedroom on courtyard, while it sounds nice, means it is dark.

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