What is the impression of the narrartor, in the story Typhoid fever??

The diction is that of a child. The sentences are simple and crisp. He uses simple phrases and words.There is a truth in the narrator's simplicity that is authentic, almost pure,

"I can’t sleep because I see people in the other beds all dying and green around their mouths and moaning for soup Protestant soup any soup and I cover my face with the pillow hoping they won’t come and stand around the bed howling for bits of my chocolate bar."

The narrator is reliable by the simple fact that he sees the world through the eyes of a child who has no reason to manipulate or alter the situation.