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Good shout on the mask. We have 14 days to declare any issues with the flat, so we can claim money back from the previous occupant (this is not in the UK obviously), so we're in a bit of a rush. All the windows are identical in the block so I'll ask first if anything similar has been reported before.
The flat has always been occupied, and there's some mould on a wall that was painted 5 years ago: it's the last occupant that did not ventilate enough.
First step might be too just scrape all the mold off and see if it comes back? I'd wear some breathing protection