Personally, I don't think that MSI Carrara Breve quartz is a good option. You have knotty pine + real slate floors = cozy lakeside cabin (I assume lakeside based upon the photo on the wall).

Your multicolored slate flooring has rich earthy tones (rusts, charcoals, and deep grays) that perfectly mirror the natural, rustic appearance of soapstone. Soapstone's deep charcoal tone will help anchor the room - it will pull in the darker shades that are in the slate floor. Soapstone (a natural stone) fits with the architecture of the space vs. fighting it.

MSI Carrara Breve's white background (it may be a warm white - but it still looks pretty white in the photos I've seen) + its delicate faux-marble veining are designed for contemporary or transitional urban/suburban kitchens. Next to the heavy, warm, dominant wood grain of knotty pine, a white faux marble quartz will look "plastic" and artificially bright. It seems like it will disrupt the home's organic, cozy aesthetic.

Here is a photo of a Houzz user's kitchen with Carrara Breve quartz .- her cabinets are painted BM Simply White + she has a walnut island.

You could also use a leathered black granite - slabs like Absolute Black, Black Mist, or Negresco in a leathered finish will provide a deep charcoal-to-black color with a subtle, dimpled texture. It mimics the organic, historic feel of soapstone. You could also go with a honed finish if you don't want a leathered one.