If it is a scope like tile or flooring I have them also do a room before moving on to the next room to review quality of work.Also, I have asked to go see their home, several in the past never finished projects in their own home and quality was shotty - that was an easy pass using them.

I have no carpet anywhere in my units (only hardwood and tile or LVP), with a few washer safe throw rugs.5.

HOA unfortunately won’t allow a hot tub so was thinking of installing a sauna and steam shower with heated tile bathroom.

DO NOT get expensive appliances or fancy tile or marble counters...all of that doesn't matter and will de destroyed over time.   

I bought SFR under 20 years old in a market with no damaging weather, stucco siding, and tile roofs for basically zero exterior maintenance.

Do I make the contractor or the subcontractor/supplier sign the lien-wave? 

You’ll want to confirm it wasn’t undercut or weakened.Moisture and drainage – Make sure there’s proper drain tile, sump, and grading.

@Scott Po concrete tile foundation drains are common on older houses (1910 - 20's and up) that had basements.   

Just scroll to the bottom of your listing link and you can see 4 places that are quite a bit nicer for under $1500.You are offering small 900sqft with an original kitchen, only ONE bathroom that is dated and has no counter space, an interior that is a mix of finishes and colors, tile ceiling, super basic light fixtures, no garage and a totally overgrown yard - all of that screams total neglect.

I put in ceramic tile all throughout.