Food is really good and authentic. The chef even came by and asked us what we thought. I had the Kalbi short rib and it was delicious. We also got the Kimchi pancake and it was one of the better ones I've had. This place is the real deal.
Only downside is that it really is just a hole in the wall and has some of the disadvantages that come with that (small, a little dingy, etc.). However, oftentimes the best Korean food is found in little places like this and it certainly has that small restaurant charm that Pittsburghers are so fond of.