HOW TO MIX WOOD AND METAL IN ONE ROOM

Give 70% of the room to one material and 30% to the other. Wood on floors and joinery, metal in legs, lighting and handles — and no more than two metal finishes per room.
WHY 50/50 FAILS
Wood warms, metal sharpens. Split them evenly and the room reads like a material sample board — nothing leads, so nothing resolves. One material has to own the surfaces you see from the door; the other one punctuates.
MATCH THE TEMPERATURE
Warm brown timber pairs with brass or bronze; grey and blackened wood pairs with nickel and matte black. Mixing warm timber with bright chrome needs a third material to bridge them — heavy linen, natural stone or leather. Then let one finish own everything you touch: handles, taps, switch plates. Mismatched hardware is the fastest way to make an expensive room look accidental. If the room still feels cold, add a heavier texture rather than more wood.