How does the narrator feel when he first enters the house?

When the narrator first enters the house, it immediately brings back familiar memories of his childhood. He also mentions that the familiarity was not quite the same...... as if something were wrong.

Much that I encountered on the way contributed, I know not how, to heighten the vague sentiments of which I have already spoken. While the objects around me --while the carvings of the ceilings, the sombre tapestries of the walls, the ebon blackness of the floors, and the phantasmagoric armorial trophies which rattled as I strode, were but matters to which, or to such as which, I had been accustomed from my infancy --while I hesitated not to acknowledge how familiar was all this --I still wondered to find how unfamiliar were the fancies which ordinary images were stirring up. On one of the staircases, I met the physician of the family. His countenance, I thought, wore a mingled expression of low cunning and perplexity.