Holy Sandwich Shop is widely praised for its exceptional burgers, attentive service, and vibrant atmosphere. Around 95% of reviewers highlight the quality of the burgers, often calling them "the best" and mentioning the flavors as "fantastic," "juicy," and "perfectly cooked," with the Holy Burger and Super Duper cited frequently. Approximately 90% of reviews appreciate the service, describing the staff as "friendly," "attentive," and "funny," contributing to a welcoming environment. The ambiance is enjoyed by about 85% of reviewers, who describe it as "cozy" with a "character-filled" setting, though some note the hard rock music might not suit every taste. Roughly 10% of reviews mention long wait times, advising to arrive early to avoid queues, yet this is often seen as a testament to the shop's popularity. Overall, the combination of food, service, and atmosphere makes Holy Sandwich Shop a highly recommended stop in Porto, although some rare complaints concern wait times and oversalting of fries.