Good answers here already!
I second the clean and de-clutter (also de-personalize: remove all personal photos and effects--you're moving anyway--go ahead and start packing!) ;^); have landscaping cut back/minimized.
~Pay attention to kitchen and bathrooms FIRST--they don't have to be updated, but be sure they are CLEAN, and if you do spend any money on improvements--spend it here!
~PAINT: next to cleaning, fresh, NEUTRAL paint is your BEST dollar-for-dollar improvement!
~Flooring: if it is worn or outdated--REPLACE it! New carpet is not expensive, and worth every penny if yours is not a neutral color. (No, pink is NOT neutral!) :-)
If you need HELP with any of these items--please do call "The Problem Solvers" at Real World Properties!