We didn't try the restaurant but went twice to the tapas bar. It serves food from the Basque country (the tapas are called pintxos), The place is decorated with taste amd has a warm and classy atmosphere. The tapas are very good and the wine (Malbec) was excellent. From our (limited) experience, probably one of the best places in San Telmo in terms of quality. Quite a number of Argentinanins were there everytime which is a good sign.
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