Which descriptive details of the interior of the Usher house suggest that narrator enter?

The decaying and oppressive atmosphere, the dimly lit rooms with old-fashioned decor, and the sense of foreboding and unease all contribute to the narrator's feeling of dread as they enter the Usher house. The descriptions of cracked walls, cobweb-covered furniture, and the pervasive silence further emphasize the haunting and unsettling nature of the house.