Maximize small apartment space with paint tricks. Light neutrals reflect light and expand rooms, while a single accent wall adds depth. Use satin or washable matte for walls, flat white on ceilings, and semi-gloss on trims to define edges. Keep colour flow consistent in open-plan layouts, and pair with mirrors and pale flooring. Avoid overusing dark tones, strong contrasts, or glossy finishes on large walls for a clean, spacious look.