ambasada śledzia is one of the places you should definitely crawl into while visiting krakow.
not only the interior, both inside and outside, is stylish (i love street art, walls full of posters etc.) but also the offer is pretty great. they serve drinks, shots, beverages and food for very reasonable prices.
go there, try one of their typical herrings followed by vodka and let you stomach willing to kill you :-d we´ve experienced that at 11 am during our free food walking tour (which i highly recommend by the way) and had an awesome time at this bar.