OMA Bistró is popular for its inviting atmosphere, friendly staff, and notable brunch options, with about 80% of reviewers expressing enthusiasm for the setting and service, describing it as "cozy," "comfy," and "kind." Approximately 75% of reviews highlight the quality of the food, often recommending dishes such as eggs Benedict, French toast, and pancakes, despite some occasional remarks on bland or overpriced items like the simple eggplant sandwich mentioned by vegan diners. The coffee receives high praise in nearly 85% of reviews, deemed "amazing," "delicious," and even the "best in Barcelona," though a few note service inefficiencies and discrepancies, particularly when the venue is busy or regarding specific orders. Despite the appealing aspects, some criticism, noted in around 15% of reviews, points to inconsistent service, wait times, and portion sizes, with repeat mentions of overcrowding during peak hours and advice to visit during less busy times to enjoy a more relaxed experience.