Dipi, the tour guide, is an amazing person, who loves to talk and share his opinions. We spent 5 hours together, talking about all topics: history, culture, politics, society, cinema. He has a very good level of English.
He comes on time, brings both helmets and rides his bike very well.
Why hire this tour? Because you can see many places, then you can choose if you want to come back to one of them. I had already been to Calcutta 4 times and with this tour I realized that I still have a lot to discover about the city and the bengali culture.