At first, the story felt psychological, then it felt like horror.
The Yellow Wallpaper is a short story, about an unnamed lady with postpartum depression or mental illness.
 Her husband is a doctor and rents a mansion for summer and makes her stay in a room on the upper story. He forbids her from writing and doing any other work and she remains in this room with yellow wallpaper which is torn from places peeling. She feels that the wall papers’ smell lingers, she can smell it everywhere in the house, even when she goes out with her husband, she feels that her hair smells of the wallpaper.
I felt sorry for this lady as she keeps staring at this wallpaper, trying to interpret the pattern. She is portrayed as a wife who is not able to share her true feelings with her husband. Even if she was unwell, she should have been allowed to meet her relatives.
The ending was a bit ambiguous. I found the conclusion a bit hard to interpret. Freedom?
It is depressing to read about ladies of that era, life was difficult and to add to their woes if they ever wished to educate themselves or write, it was not allowed. Moreover, mental illnesses in women were not treated properly.
It is a short story, and it helps if you down want to be bogged down with a tome!