If the subfloor is heavily stained when removing carpet, you may need to seal it as well with a good shellac type sealer before recarpeting.

She told him to just fix the water stained areas of the ceiling.

The first flip I did, I walked right by the giant water stain in the ceiling, and said "oh that's probably just a few rivets on the metal roof that need tightened."

The problem I've been having as you would expect is constant stains and damage to the light tan carpet.

If it's worn or stained, just have it refinished, that'll be cheaper than new floor and look better...

For example if I know there's a stain in the carpet in the living room I'll write that down or other things like that. 

@John Warren I have heard granite won't stand up as well because it stains easier.

On a typical move-out/move-in job I had my "standard" tool box plus a materials box containing;the standard paint color I used for rentals-Navajo White, a bunch of paint stirring sticks (for sheetrock repair more than stirring paint), a couple of pieces of sheetrock 2' X 2', Elmer's glue, sheetrock screws, switch plates, a couple of outlets and switches, scrubbing stuff and chemicals, DOORSTOPS, light bulbs, mineral spirits and linseed oil and 000 steel wool for touching up stained wood, paper towels, TOILET PAPER, rags, paint brushes, SMALL LADDER, joint compound.Once you've gone through every room doing the "touch ups" you'll have a good idea if you need to come back with your 8' and extension ladders, paint rollers and 5 gallon can of paint and drop clothes.

If stain remains, apply rust remover or oxalic acid solution. 6.

I had modest success by wiping on and then wiping off some cherry-colored wood stain on a reddish floor.