Being Serbian, I definitely know my cevapi, pljeskavice, ajvar, etc...
Their cevapi are awesome. Ajvar (roasted pepper spread) is to die for. Pljeskavice are pretty good, too. I haven't had any of the chicken or "generic" stuff, so I can't really comment on it.
Takes a little long for the food but they grill the meat fresh so I'm definitely not complaining. A little pricey but totally worth it for some extremely filling Serbian classics.
The staff might come off as a little rude, but that's typically how eastern Europeans come off, so don't take it to heart.
Will definitely return and highly recommend this place (if you're not in a rush).