I am going to say the B&W. The B&W does more in the way for the wall textures and geometry. The subtle motion of the fan is also more noticeable. This image, to me, is more about form, texture, and light than it is about a specific "place."
Also, in the colored version, the sky looks a bit too much like pool water.
I like the B&W conversion because of the tonality of the shot....I am not fond of the bright blue skylight, maybe deepen it to look more light twilight.
A bit of a tough one because there is some good color contrast that you lose in the B&W, but since the image really is about shapes and line, not color, I'd have to say B&W.