It creates an anxious feeling.First, because of the meaning of the word anxiety;distress or uneaiyness caused by fear.Fear is observed when the narrator speaks of feelings such as .."iciness, sinking and sickening of the heart.."Apart from that ,the narrator expresses he is anxious by using the phrase..."so unnerved me.."It is clear that the simple view of the House of Usher brings a sense of overwhelming dread in the narrator."..The features .." he describes with these articulate words connected to decadence and decline cause nothing but a feeling of anxiety.