The setting

      According to the title of the story "The Fall of the House of Usher" we understand that all the events depicted in the story will occur in a house. E. A. Poe created a really horrifying image of the house:

''I know not how it was--but, with the first glimpse of the building, a sense of insufferable gloom pervaded my spirit."

      So, we understand that the author created such an image of this house that it terrifies you from the first sight.

      When we read the story further, we come across its description:

    "I looked upon the scene before me--upon the mere house, and the simple landscape features of the domain--upon the bleak walls--upon the vacant eye-like windows--upon a few rank sedges--and upon a few white trunks of decayed trees--with an utter depression of soul which I can compare to no earthly sensation more properly than to the after-dream of the reveller upon opium--the bitter lapse into everyday life-the hideous dropping off of the reveller upon opium--the bitter lapse into everyday life--the hideous dropping off of the veil."

      After reading the first paragraph of the story I understood at once that it will be a horror story, because with the help of the depiction of such a house the writer creates the mood of the whole story. E. A. Poe describes the setting of the story not only outside: " I scanned more narrowly the real aspect of the building. Its principal feature seemed to be that of an excessive antiquity. The discoloration of ages had been great. Minute fungi overspread the whole exterior, hanging in a fine tangled web-work from the eaves. Yet all this was apart from any extraordinary dilapidation. No portion of the masonry had fallen; and there appeared to be a wild inconsistency between its still perfect adaptation of parts, and the crumbling condition of the individual stones. In this there was much that reminded me of the specious totality of old wood-work which has rotted for long years in some neglected vault, with no disturbance from the breath of the external air. Beyond this indication of extensive decay, however, the fabric gave little token of instability. Perhaps the eye of a scrutinising observer might have discovered a barely perceptible fissure, which, extending from the roof of the building in front, made its way down the wall in a zigzag direction, until it became lost in the sullen waters of the tarn." 

But he also describes it inside: "The room in which I found myself was very large and lofty. The windows were long, narrow, and pointed, and at so vast a distance from the black oaken floor as to be altogether inaccessible from within. Feeble gleams of encrimsoned light made their way through the trellised panes, and served to render sufficiently distinct the more prominent objects around the eye, however, struggled in vain to reach the remoter angles of the chamber, or the recesses of the vaulted and fretted ceiling. Dark draperies hung upon the walls. The general furniture was profuse, comfortless, antique, and tattered. Many books and musical instruments lay scattered about, but failed to give any vitality to the scene. I felt that I breathed an atmosphere of sorrow. An air of stern, deep, and irredeemable gloom hung over and pervaded all." 

    Judging by the description we understand that the house is very big and old and nobody takes care of it and it is starting to ruining. Generally while reading the story we don't come acrosss the information about the geographical location of the house and the time then the events take place. But we can draw a conclusion that the aproximate time when the events take place can be the 19th century.