At the same time, I can get custom cherry/oak cabinets for $3K, WilsonArt countertops for $1K, new ceramic tile flooring for $800, a travertine backsplash for $200 and all new stainless (the fake stuff) appliances for $1400.

It's much better to rely on 3/4" oak tongue-and-groove flooring sealed in place with two heavy coats of oil-based polyurethane over it, or well-laid ceramic tile.

Buy a bunch of the 1940-50 2/1, 3/1, 3/1.5 for $10k-$20k, fix with new breaker box, roof, 12" ceramic tile floors every where (bullet proof). 

I've replaced the ceramic tile in my own  laundry room with some recently.Lowes carries LVP but our local Lowes only appears to have the ones that "click" together. 

Vinyl plank flooring would be my next choice.Or if the floor underneath is level and thick enough go with ceramic tile.

I do ceramic tile, 100%.  

In April 2017, we had to re-tile the whole bathroom floor and some of the wall with ceramic tile, which cost about $1250.1.

Additionally, neutral colors tend to have a calming effect and can make spaces feel larger, making them more appealing to renters.As for cabinets, laminate or vinyl-covered particle board cabinets are durable, low maintenance, affordable, and versatile, making them a popular choice for landlords.When it comes to tenant-friendly countertops, there are several options to consider:Laminate: Laminate countertops are durable, low maintenance, and affordable, making them a popular choice for rental properties.Ceramic tile: Ceramic tile is a durable, low-maintenance material that can be easily cleaned and comes in a variety of colors and finishes.Solid surface: Solid surface countertops, such as Corian or Formica, are low-maintenance and can be easily repaired if they become damaged.Granite: Granite is a durable, long-lasting material that is heat-resistant and easy to clean.

No known issues with the concrete slab other than a bit of mortar I still need to grind off here and there due to the old ceramic tile.  

Nothing too fancy, just imitation wood ceramic tile with stainless steel appliances and nice shutters, but there are no units available in the market with these characteristics, so I have had up to 23 people going to the open houses and my units normally rent in a couple of hours once they are remodeled.