The couch is as described, I would say it’s on the lighter side of charcoal grey.  Sits low, but it’s firm and very comfortable.  After the very first night we wake up to one of our dogs on the couch, which is a no-no so he clearly could not resist the comfort as well.  
As to being “ stain resistant” material, I have to admit, where my dog was, there was drool.  I wiped with a damp cloth and it came clean - thank goodness.