Some minor fixes on the siding, which I did myself and I had to stain the outer deck.

Big believer in having hardwood floors, yes they can get damaged just like anything else, but are easy to fix ( scratches, big gouges or water stains that may have been incurring for years are harder to fix, but you can replace just that spot). carpet would have to get changed a lot more, not to mention possible health problems for new tenant if you do not deep clean them after the old tenant leaves. as far as noise, yes you will get some down stairs, but i wouldn't worry about it. suggest to people when they move in that they can put down area rugs.

Some time there must have been a water issue causing the staining.  

All the staining Ive done in the house is a very dark color.

The place smells a little of smoke, the one room has some poorly cleaned up pet stains and the appliances are a mess. 

We have so much sun in our unit that the current (cheap) laminate has "sun stains" / major fading around the carpets.

The upstairs windows are broken out, replaced with plywood, and there are smoke stains around them.

It is a stain on our nation that in retrospect was a horrible mistake and completely unjustified. 

I there are leaks in the attic, major staining on the shingles, places where shingles have been replaced with discolored shingles, or the lower sections of the roof getting a lot darker than the upper section, these are indicators that the shingles are nearing the end of their life and will be a red flag to appraiser. 

You need to be very organized with extra linens and other things that can stain and need immediate replacement.