Pros
First of all, its good to see they are one of the few people who are bringing start-up culture to Kolkata. Very go-getter attitude among the employees, open to ideas and very adaptive to change. Like the fact that if you have a better way to implement a thing you are free to implement it. Flat organization, good learning scope and the founder (Varun) is very interactive and pro-active in projects. Good projects too.
P.S - free snacks, lunch and occasional hangouts with the team.
Cons
Not really a con but the office could've been situated in the IT hub of the city like New Town or Salt lake, which I think will happen anyway after few months, as the company gains more traction.