From my only visit...
Pross first: The place is clean and waiters are polite... polite but not professional!
Cons: we were a group of 20 colleagues went to Nawab for a leaving lunch do. reservation was made days in advance, so they must have been expecting a large group. The food arrived at our table after approximately 50 solid minutes of wait. nothing was offered in compensation. we had to ask to be compensated. My dish was extremely salty. I got few other colleagues to taste it to make sure it's not just me tasting so much salt in this food! they all agreed, so I sent the food back. I did not ask for a replacement but i was "offered" another dish, and as we were already very late to get back to work the waiter offered to have it boxed to take away with me. Once we asked for the bill i was surprised to see that I was charged for what normally would be offered as free food, as a sign of apologies for their disastrous service. I refused to pay and they kindly accepted it, but I shall never go back to this place.
NOT RECOMMENDED!