Narrator and point of view

The short story “The Outsider” by H.P. Lovecraft is told by a first-person narrator who is also the main character. 

The narrator is analytical, and an observer of his surroundings. His account is detailed and vivid, which helps readers have a better view of what is happening:

I know not where I was born, save that the castle was infinitely old and infinitely horrible; full of dark passages and having high ceilings where the eye could find only cobwebs and shadows. The stones in the crumbling corridors seemed always hideously damp, and there was an accursed smell everywhere, as of the piled-up corpses of dead generations. It was never light.

In this example, the narrator provides a detailed description of his surroundings. It should be noticed, though, that even though the narrator is good at observing his surroundings, he...