Unintentional neglects are real sales stoppers. 

Sometimes, after spending many comforting years in their homes, sentimental and subjective sellers overlook potential home sale stoppers. Points of neglect by the seller, such as stains on the ceilings, drains that run slowly or walls which show signs of pipe leaks, are all red flags to buyers. The seller who have lived with these malfunctions can let their emotional attachment overshadow their practical judgment. Beware! These problems become deferred maintenance nightmares to potential buyers.

Also, make these improvements before you sell:

Clean up and remove clutter

A new coat of paint, new carpeting, freshly manicured landscaping, updated fixtures, windows, doors and other touches can put your home in the best light.