Where do the young people of Mumbai hangout?

I am from Hyderabad. We are planning to launch a new dessert cafe in Mumbai and are very keen to understand which are the most happening areas where the youngsters of Mumbai hangout? Our target market is not limited to students only, but anyone between 18-30! More importantly, we are introducing a new concept and would need people who are willing to experiment and try new things! Any insights will be really appreciated Thank you in advance!