Last year I went to Kolkata, my most of cousins are from Kolkata. We all made plan to go out at late night, but unfortunately I missed it because I was not well. My sibling and all cousins went their at late night or you can say early morning at sharp 2 am.
It is located at Bhawanipur area, and the main reason of going there is just a famous drink of Balwant Singh Dhabha - Doodhcola - A big glass of Milk and Cola drink.
It is pure vegetarian Dhabha, well known and famous for this strange drink, fully air conditioned. My sibling who never drink milk, but liked this drink. I was just shocked and missed it, but surely I will go their this year.
My cousin told me place is like Normal Road side dhabha, but awesome food specially Tea and Doodhcola and any Tikka.
Service is good, place is safe but it will much better if we go with family.