Avoid decorating mistakes in small apartments such as overcrowding the space with mismatched furniture, ignoring lighting layers, and skipping visualization before buying. Not applying cohesive color schemes like the sixty-thirty-ten rule can create chaos. Failing to measure furniture or rugs results in awkward flow. Overdecorating surfaces causes clutter instead of warmth. Prioritize intentional spending on lighting, layout, and large pieces, then curate accessories thoughtfully. These precautions prevent costly errors and ensure your 800 square foot home feels spacious and welcoming.