Which color would you recommend for rental units for following.1) kitchen cabinets2) luxury vinyl flooring color3) paint color walls, ceiling etclastly, would vinyl click and groove plank flooring be ok in washroom too or you recommend tiles?

Maybe change the wall colors and stage the place to make it look like a new listing. 

White paint goes a long way, modern colors like gray on the exterior of your house with accents of white colors will transform the appearance.

Move-in gifts (to help settle into a new home), Spring Time gifts (a colorful plant bowl), and Holiday gifts (food or entertainment) can nurture relationships.

They make all kinds of colors/textures.

I recently was replacing vinyl blinds at a property and noticed within hours of putting them up, they seemed off colored and splotchy.

Just make sure you are balancing it with some color.  

Congrats, love the color of the exterior on this one!

My 2 cents as a contractor and someone who has worked for a cabinet maker in the past...Color shouldn't matter that much as long as you're doing paint-grade cabinets and using a good quality paint.

We agreed & he has since painted all 4 bedrooms at their cost after my wife & his wife approved the colors.