I didn't give it five stars because as others have pointed out, it's not a clean restaurant. But the food is absolutely amazing. First tip, do not order salad, although it comes as a side with many dishes.
The Naan is freshly baked and goes well with all their currys and kebabs. Friends have ordered the curry and been happy all the time. Another friend ordered the seafood dish and was impressed. The beriyani is huge and can easily feed two people.
I have tried their Bihari and Afghani Tikka and they are amazing. Also for exotic food lovers, they serve Maghaz Masala, which is sheep's brain mixed with spices. I had tried sheep's brain many times before, but my friends were very hesitant at first. With first bite, they were in love.
Update: I am not a fan of chicken breast, but Chicken Boti was very tender and delicious.