Lovely small restaurant, no problems seating us (a couple) on a Friday night approx 21:30 with no reservation. The staff were very friendly and attentive, going out of their way to explain the specials to us in English (and later, one of the deserts that I couldn't work out). Enjoyed a wonderful 3-course meal with a great bottle of red wine for €45 total. Easy walking distance from Barcelo Sants (where we were staying, but also the main train station in Barcelona for metro/RENFE etc). I look forward to eating here the next time we're in Barcelona, and recommend that if you're in the city you pay SNB a visit!
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