If you get a slipcovered white sofa, easy to clean.

A white couch is fine as long as you are careful about eating and drinking and absolutely vacuum it thoroughly on a weekly basis. Its dust that will get it looking dirty. It's a hard color to steam clean as it usually gets water stains and many cleaning companies won't touch it. Another suggestion is a white leather which would be easier to upkeep.

Your ideas and color scheme sound lovely.

Hi---slipcovered sofa is the way to go if you're thinking of white. Your color scheme sounds wonderful. Make sure when selecting wall color, consider the golden honey hues in your wood floors. Hope this is helpful. Good Luck!
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