Re: What would you do with this floor?
In your photos it looks like you have a shadow line. At one time the floor was partially covered by a rug. The rug shaded the area under it but the outside edge was exposed to UV from sunlight and is slightly bleached. You can either live with the shading until it evens out, cover that area with a rig again, or refinish the floor. If you can live with it, I would just clean the floor, buff it, and is necessary apply a new coat of finish, or try a floor rejuvenater.
Be sure you live your life, because you are a long time dead.-Scottish Proverb