Time Out says
La Fisna's owners, who are clearly big fans of Burgundy (you'll find several French wineries represented here), have made the leap from a wine shop to a bar, though there's still a room that serves as a shop. They make use of an entire wall to display show the house specialities (some of which change from time to time), and you'll find several high tables and stools, a bar they inherited from the previous owners, and posters and exposed brick to decorate the small but pleasant space. Not only can you choose from dozens of wines by the glass but if you fancy sampling a few different ones while you're there, you can also order by the half glass. The simple menu lists all the wines, and though it's easy to get lost in the vastness of the names and varieties – not all are well-known, which is a good thing – you can ask for advice and suggestions from the knowledgeable staff. When you feel peckish, you can order from treats such as cold cuts, cheeses, roasted peppers with mackerel, 'salmorejo' cold soup... Not only there is quality in their selection, they also pay attention to details. Even the bread is handmade from sourdough. La Fisna is an essential stop in Madrid for anyone interested in wine culture.