Who does the speaker think is responsible for the shoddy condition of the wallpaper?

From the text:

The paint and paper look as if a boys' school had used it. It is stripped off—the paper—in great patches all around the head of my bed, about as far as I can reach, and in a great place on the other side of the room low down. I never saw a worse paper in my life.

The color is repellent, almost revolting; a smouldering unclean yellow, strangely faded by the slow-turning sunlight. It is a dull yet lurid orange in some places, a sickly sulphur tint in others. No wonder the children hated it! I should hate it myself if I had to live in this room long.

The narrator believes the children are responsible for the paper's condition, as they must have hated the pattern.