Wood looks fake, dont know why but I think its "wet" I would decrease the saturation.
Your Sun Size is 1 probably, the light on wood would look a bit more natural if that would be changed.
I suggest adding a plane with alpha map in opacity in front of the windows so that you get some nice looking shadows.
Re-scale the fabrics on sofa. Carpet looks like its made of suede. Add some bump and reflection to all your walls so that light spreads nicely.
Check albedo I belive your roof is more than 200+ white.