Playing devils advocate here, this looks like plain old neglect by the resident of the quarter.
A wipe with some mould remover would sort this out. I've lived in some shitty quarters and had mould problems but always managed to contain it and prevent it from reappearing.
We own our 1920s house and it could be a mould trap since putting in new windows and insulating it to within an inch of it's life it retains the warm damp air we breathe out/create whilst cooking, showering etc.
We keep it very well ventilated by opening windows every day to change the air and have damp traps in enclosed unheated cupboards and a dehumidifier. We can't go to a helpline to moan as we own the house.
Some houses are just harder to look after than others. Leaks through the roof however do need fixing.
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And the image below, a bit of weedkiller on the ivy outside and removing the offending weed, hardly rocket science.
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