It is supposed to make the reader uncomfortable and nervous. Certainly not a cheery home. Notice that her father is watching the meeting silently through his picture. He dominates the room, as he may dominate her life even though he is dead. Every tiny detail in this story has a purpose, so it is important to notice every tiny detail and figure out its purpose in the story.
Every word is chosen with great care to show something important.
Also notice when there are short sentences, and also notice when they are set apart or start a paragraph. This is to call your attention to them, so they are important. She enters, and they stand, like good Southern gentlemen. This indicates something that was once valuable and shiny is now faded, dead, and blackish, like the Old South, the house, the values, and Miss Emily herself. Since they are not invited guests, she does not ask them to sit down.