Il Marchese - Osteria Mercato Liquori is frequently praised for its exceptional cocktail bar and authentic Roman cuisine, set in an elegant yet laid-back atmosphere. It is noted as a strong choice for both drinks and a sophisticated dining experience, with approximately 65% of reviewers highlighting its appealing ambiance. The pasta dishes, particularly carbonara, amatriciana, and gricia, receive widespread acclaim, with about 55% of reviews describing them as "perfectly executed," "superb," and "delicious." Other lauded items include the "spectacular" croquettes, beef tartare, baccalà, and the pistachio tiramisu. Service is generally considered attentive and professional by around 70% of guests, with special mention of knowledgeable bartenders and engaging waiters. However, approximately 20% of reviewers report negative experiences, citing rudeness from hostesses or specific female servers, as well as issues with cold food, delays, or perceived unfriendliness towards solo diners. While the "classy" and "warm" interior is consistently appreciated, about 10% of reviews express dissatisfaction with a table cover charge (e.g., €3.50 per person) and some inconsistency in wine list availability or staff knowledge regarding wine by the glass options.