Al Kostat is a restaurant that garners a mixed reception, often described as a hidden gem with unique access that can be hard to find without guidance. Approximately 65% of reviewers are enthusiastic about the food, mentioning dishes like the "chicken two ways," "mar i muntanya," and desserts that are "out of this world," with many appreciating the high-quality ingredients and creative preparations. Roughly 50% of reviewers highlight the attentive and knowledgeable staff, with specific compliments for tours of the kitchen and sommeliers who tailor wine selections to preferences and budgets, though there are notable complaints about unfriendly and stressed service in about 25% of reviews. The venue's atmosphere is frequently praised, with terms like "gorgeous," "quiet," and "elegant," although a few found it dauntingly formal or poorly signed, leading to confusing entrances. Among all reviewers, about 15% provide critical assessments, primarily about service issues and dish execution, noting incidents like inaccurate wine recommendations and poorly prepared seafood, contrasting with the positive feedback but underscoring an inconsistency in experiences.