What are the narrator's first impressions as he draws near the House of Usher?

In the story, the narrator first sees the House of Usher in the very first paragraph.  You can look there for more details...

As soon as the narrator sees the house, he starts getting very bad feelings about it.

with the first glimpse of the building, a sense of insufferable gloom pervaded my spirit

He says that it filled him with melancholy.  He didn't like the way anything looked -- the house, the wall, the area around it.  He says the windows looked like empty eye sockets and the trees looked decayed.

The first paragraph of the story gives many more things that made him feel the way he did, but the overall first impression he gets is very definitely negative.