The Cascais Boutique Hostel is a perfect way to explore Cascais. The ad is completely accurate, and the place has a stylish, rustic, atmosphere. It was spotlessly clean, and the hostel staff were polite and informative.
I was a little worried before arriving because there are some negative reviews, but perhaps those visitors were just unlucky, or had an unrealistic expectations of what's classified as a hostel.
I would stay there again given the option.