I'm thinking sand, stain dark, and apply a few coats of polyurethane to really make it shine and pop.

I paid to have them refinished and stained.If stained correctly you will add durability to the floor.

Wondering what type of flooring everyone uses in MFH rentals and why.Looking to replace old vinyl in a kitchen of fourplex but head that tile is a bad idea due to stained grout and other possible damage.

That looks like nice oak stained trim.For a rental.

Carpet holds dirt and stains easily, tile chips and cracks, vinyl can get nicks and cuts, and laminate and real wood are susceptible to water damage.

Once the stain sets into the middle it is never coming out.

No checklist, no move-in with the apartments I used to live in.Maybe they have questions, don't know what your standards are, are busy unpacking, or not sure if a carpet stain or something small is worth noting on the checklist or normal wear and tear.If they don't submit the checklist, what's to stop them from claiming some damage was already present-- when they caused the damage?

What is directly above the stain in the attic?

Sounds like you got a nice one, don't forget some deck stain underneath, it's the ceiling of your patio.

There are stains on the ceiling that prove this fact.