All great insights already here Winn, but if you are able to oversee the painting, there are some ways to help with this often unavoidable turn over expense....For example, this time insist on some high end paint (think specialty paint store or the very best big box stuff); try a pearl or washable finish; I like one color for all the interior of all my units, ideally a white that can hide some imperfections (know and keep the code); this means no color or matching mystery later; then on the next turn over, see if you can't get away with just a wall cleaning; use a damp sponge mop with tsp or a tsp substitute  (and then rinse it with a clean water and a damp sponge mop)..not too much water, just damp.. 

Especially a place that wasn't a tiny apartment in a noisy apartment building.The one I moved into and rented, was a horrible pink color inside.  

The main body color is Sherwin Williams Storm Cloud (SW6249).

In fact she bought one with the laminate flooring.Plus, with carpeting, you won't know the taste of the people looking to buy - what color, type, etc.  

Someone may have lost weight, gained weight, changed hair color, gotten eyeglasses or contacts, etc.  

I would look at adding some annual flowers with color.  

And make sure that right is grandfathered in.Oh, and the same board, while I was on it, chose new paint colors for the complex.  

I would offer a color pallet for the tenant to choose from. 

It doesn't necessarily refer to color, you can use it with any color, or white for that matter. 

Make sure you select colorful items to give it a pop of color.