It's an odd story, to be sure! The Guardian - and many others - picked it up from a series of TikTok videos, posted by the lady herself, on that one-minute video-sharing platform.
Taken at face value, we are bound to wonder why she did not, quietly, make good use of the unexpected expansion to her flat, once she had shut off the open windows, which seem to have caused the draught?
I like the idea, however. I have recurring dreams of discovering sinister new/old rooms in my house. They never seem useful, either!