We personally like the slightly darker neutral color, higher end remnants but the darker color is because it hides stains better in the rentals.If laminate is not worth the cost/effort but the carpets are really worn you may desire to look at what is available in remnants in your area. 

I am looking to keep this one pretty simple with stained concrete or tile (whichever is cheaper) with carpet in bedrooms and typical average finish out besides some granite counters.

For just a few extra bucks, you can get nice cherry-stained cabinets and granite-looking Formica countertops.

Assess a cleaning fee to remove any odors or stains.

I might have to replace the carpet for second/third floor there were stains.

The asking price is $25,000, and it needs 10-15k in repairs, mostly cosmetic (i.e. resand/stain floor, drywall work, paint, etc.)

I stain it and then paint a 16 inch grid/groutline to camoflage the seems, and oil base floor varnish as a topcoat.

Basics of slopping floors, cracked walls or ceilings, doors that don't close, water stains, sagging roofs and identifying load bearing walls are things you should understand.You don't need to be a certified inspector but usually knowing basic construction techniques and standards will allow you to inspect well enough for an initial assessment.

The kitchen cabinets need to be stained or painted.

For example, painting a wall or room; hole in wall or door; replace carpeting due to stain (not groom normal wear and tear).Gives them something to think about.