I have been going back and forth if i should put quartz white countertops in the kitchen and bathrooms, some people tell me quartz white does stain one being my sister who recently got quartz in her house- but store owners tell me no quartz doesnt stain and it is the most durable. some people tell me the 2cm is the best and most popular size , but i believe the 3cm is better since it is thicker and can possibly last longer.

Hey Khari, Everything Durable!

Set expectations, take a deposit, get durable furnishings, make lots of money.

Ideally, I would like to replace the floors with something that would look good while I live there but would also be durable enough when I turn it over to renters.  

All of these issues can cause your price to range from $5/sq ft for basic paint and carpet to almost $100/sq ft for professional contractors and structural issues and more durable finishes.  

If this unit is going to turn into a long term furnished rental buy durable nuetral furnishings. be sure to include good mattress covers for the bed.

In other words, you need an unfair advantage, a wide economic moat, a durable competitive advantage, or whatever you'd like to call it ...

Granite requires maintenance and will stain; consider engineered quartz which is durable and maintenance free. 

Paint on stair treads and floors shall be protected with a durable cover or coating that will prevent abrasion of the painted surfaces.

The white membranes are durable, but if a problem would develop, you can find the whole and patch it.