Lawns and yard - remove clutter, cut grass, edge walks, trim hedges, Weed Gardens.
Front of house - Paint fix or wash railings, steps, storms, screens or front door.
Other Exterior - side /back door, gutters, wash windows.
Garage - Straighten up, paint, fix or wash doors and windows.
Plumbing - repair dripping faucets and leaky toilets.
Heating/Cooling - Clean exterior of unit.
Lights - replace all burned out bulbs, faulty switches.
Halls and stairs - remove any clutter to give wide appearance.
Hardware - oil hinges, tighten door knobs, faucets
General condition - dust, wash, paint, fix defects as required.
Consider feeling of spaciousness - store unneeded items to "enlarge" room size.