For dinner or brunch
It reminds a lot of the typical chic brunch restaurants in New York. I went there twice to celebrate minube's Christmas dinner. Everything was very tasty the first time (on a Thursday night) and the second time as well (I am not sure my colleagues will agree on this one).
Good meat, good mushrooms, very good anchovies and fantastic rice. The fish was not the best, quite bland. For dessert (according to Naxo's recommendation), I had the NY cheesecake, a classic. For 30€ you can have a wonderful dinner right in the Malasaña neighborhood.
Ah, and don't miss out on brunch (on Sundays)