What is Briana's favorite room in Jacob's home in the novel, Yours Truly?

To Briana, the most impressive room in Jacob’s cozy, idyllic home is his plant room. She describes, “It was a sunroom with an antique desk pushed against a window overlooking the wooded yard. He had creeping vines, plump succulents, wide-leafed plants, and hanging baskets of ferns. A small fountain trickled in the corner. It was a little humid and it smelled earthy. This place was a secret enchanted garden” (217).