Congenial (adjective) – pleasant; especially : agreeably suited to one’s nature, tastes, or outlook.
From: “The Yellow Wallpaper” by Charlotte Gillman
“So I take phosphates or phosphites—whichever it is, and tonics, and journeys, and air, and exercise, and am absolutely forbidden to “work” until I am well again. Personally, I disagree with their ideas. Personally, I believe that congenial work, with excitement and change, would do me good.”
Here, the author is saying that the narrator likes do work that they enjoy, find to be pleasant and that suits them. In this case, the narrator likes to do work that provides excitement and change.