I prefer how it looks in B&W..
And the thing is, too, that props, costumes and sets were all created or painted in such a way, to look best, knowing that they were going to be filmed in black and white, rather than in color.
Had
CASA been shot in color, there is a chance the piano would not have been painted that peach color to begin with (if that is the exact shade it was, when in the film).