How does Poe's setting affect The Fall of the House of UsherHow does it effect the story is what I want to know.

The setting in Poe's Gothic tale, "The Fall of the House
of Usher," is vital to the story as the setting (the House) is a character itself. When
the narrator first sees the house he describes it as "bleak walls," "vacant eye-like
windows," and "decayed trees." Poe provides the literal falling of the house which
alludes to the fall of Roderick and all other inhabitants of the house. The narrator’s
decent into madness echoes that of Roderick. Poe is showing not only Roderick’s
insanity, but that all the inhabitants have been infected or cursed by the same decent.
The tale becomes an encircling tale of doubling all associated with the House of Usher
where everything mirrors the literal and figurative fall of the House (both the actual
house and Roderick Usher).