Caffe Effe: Bosnian Tuna Fish?

There are so many damn dives in Chicago, it would blow your mind.  Tonight, I was flying down Belmont Ave. (on my way to that Guatemala chicken hut chain Pollo Campero) and I wrote down over a dozen holes-in-the-wall that I need to try; from Hungarian to Vietnamese to Ecuadorian, they just didn't stop (I did boldly shriek the exclamation that I'm not going to eat at the same place twice for a very long time. Hmmmm....let's see how long that one lasts).
That being said, one of my favorite places to go back to and chill is Caffe Effe, this little Bosnian restaurant on Montrose.  They have some of the very best tuna fish in the city (I'm always on a wild tuna hunt) that is served on this insanely delicious house-made, crumpet-like bread.  You'd think with the wait time (the place can be deserted and yet, still the 30 minute wait) that they filet and cook the tuna to order, but I don't know about that one (it's chock full of onions, mayon and tiny bits of celery and is very un-fishy).  They're also rockin' a delicious version of chevapi (tiny, delicious sausages), that I think about pretty friggin' often (it's between them and Memories Tavern on the chevapi, for sure). 
It's a BYOB, but really, the thing to drink is the rocket fuel coffee, especially the lattes.  You'd think you were in a back alley in Europe, wasting the day away with the vibe in here.  Caffe Effe...it's right up my Chicago alley.