The Madness Speciality Coffee Shop is overwhelmingly praised (about 97% of reviews) for exceptionally high-quality coffee, with many reviewers calling it the "best coffee in Barcelona" or "best in town," and highlighting the careful selection of beans, expert roasting, and perfection in drinks like V60, espresso, flat white, and cappuccino. The owners, especially Pablo, are celebrated for deep knowledge, passion, and attentive, personalized service, frequently guiding customers through varieties and preparation techniques to match individual tastes; several reviews note multi-generational coffee expertise and informative conversations as standout features. Atmosphere is described as modern, welcoming, and focused on coffee, with positive mentions of friendly staff and a unique, cozy environment, though one reviewer mentions "the decor isn't anything special but who cares with coffee so good." The menu also includes high-quality sandwiches and pastries, with multiple mentions of delicious focaccia and sweet items. A single reviewer (about 2% of total feedback) complains about high prices, specifically citing a 5.60€ small iced matcha, while all other reviews frame the value and quality as excellent.