Open draperies and curtains but also close them before you leave. Dripping water in or under sinks suggest faulty plumbing and deferred maintenance. Repairs can make a difference. Loose knobs, sticking doors and windows, warped cabinet drawers and other minor flaws. Who repairs and pays for repairs depends on negotiations.
Bathrooms are important.
Check caulking in bathtubs and showers. Are bedrooms neat. Do the bedrooms look neat and will your furniture fit. Do you feel a glowing warmth when you turn on all the lights for an evening inspection. Use your agent.