There are several places in the Duo family (Tartar Bar, Duo Asia are the siblings), and the common thing among them is: Book A Table. You have to call and book, otherwise, you cannot get a table. It’s not a posh place, you can come casually dressed, but the food is fancy (and good), and there is booking queue.
See the menu on the website (in English!). Prices are above average and the portions are not huge, but the entire Duo family is crazy about the taste so you won’t be disappointed. The rules of the Duo Gastrobar menu are: simple, quality products, and not more than 3-4 ingredients in each plate. The owners work here themselves, sometimes serving food and speaking with guests. The atmosphere is relaxed.
This place is great for the date or meeting with a nice person. Nice people should get nice food. Just book a table in advance, would you?