People will appreciate nice flooring, fixtures, paint, updated bathrooms (it blows my mind how many landlords will leave disgusting outdated bathroom tile and fixtures in units), etc. more than anything.

Apartment does have carpet in one room and tile throughout the rest of the apartment.

I had a bunch of construction material/debris from my last flip (some usable items like a box of partially broken tile, old sink, old toilet, but also a bunch of trash) and posted pictures of it on craigslist and offered to pay the lowest bidder to haul it off.  

Bonus points if you get an under mount sink with a quartz countertop & opt to tile the tub/shower surround instead of installing the usual rental property 1 piece.

The details as provided. 10 units(5 Duplexes), 2 bed 1 bath per unit, 640 square feet each, 2/3 acre, built in 1986, new exterior paint, new fence along parking lot, many interior upgrades: resurfaced bathtub surrounds and kitchen counters, tile floors, central heat/air.

Take note of floor plans, finishes, are they using subway tile, granite etc. etc. and then keep an eye on these houses to see how fast they sell and at what price.Now you know the standard condition YOUR house needs to be in if you want to have it sold that fast as well.

Less than 10 years old, stucco,siding, tile roof, 2+ car garage, 1800-2400sf at the lowest cost per sf (usually $55-$70).

Upon inspection, I noticed that the tiles in all three bathrooms and the kitchen have significant cracks.

., replacing all these nasty mattresses and beddings, re-caulking bathroom tiles, adding some nicer furnitures, etc..

Replace porcelain tile $75.00 ea.