One of my favourite restaurants here in Barcelona is Bestial. The other day I discovered yet another great restaurant from the same owners (Grupo Tragaluz) -Komomoto (C/Princesa 35). I can't understand I haven't heard about this restaurant before. It is such a cozy place, full of art and other funny stuff on the walls and the kitchen is open so you can see the chefs cooking. They serve Nikkei, a cuisine invented by the japanese that imigrated to Peru. Ceviche, sushi, tempura, tatakis and more. Good prices too.
I highly recommend it!