What coincidences unnerve the narrator during his reading of the book? how would you describe the atmosphere of the story at this point?

I think Poe’s description of the house in relation to its inhabitants, Roderick and Madeline Usher pretty much sound like coincidences, or are they? (cue scary music!) The gothic decrepit atmosphere of the setting seems to reflect the same in Roderick and Madeline. The atmosphere is one of melancholy and disintegration charged with a sort of urgency of a chaotic apocalypse.