Holstein is the place to get a great burger in Las Vegas. Nestled inside the Cosmopolitan, it matches the upscale atmosphere while not feeling expensive. The beer selection is pretty wide ranging as well with a lot of good craft choices on tap. The burgers are awesome with lots of choices for toppings. The fries were absolutely delicious as well. The staff is friendly and helpful about the menu and beer. Go for the decadent burger and you won't regret it.