what should be done against it? should I inform the landlord? will it be dangerous for electrical wiring?

2 comments
  1. Is that wet? Call your landlord now. Talk to your neighbors upstairs now. Something’s very broken.

  2. You mean those patches that look damp?

    Definitely tell the landlord; we can’t diagnose this from a photo. It could be anything, from sloppy workmanship to a leaking water pipe.

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