TISS had a sport facility and together with students, they organized some events where all students were welcome to attend.
It was easy to meet other international students but not easy to mingle with Indians students apart from those in your class. And my courses took place only during 4 weeks. As Indians students had also to take exams after the courses, most of them had a high load of work and couldn't find time to spend with the exchange students.
The city is big, with many things to show, and fortunately, it was affordable. I was living in the university accommodation and I used rickshaw, taxi and train to get around in the city. The city has a unique architecture with a mixture of old and new buildings, and slums. I used mouth to mouth to know the places to see, not internet. I also had the chance to visit New Delhi and the outstanding Taj Mahal which you can visit in one day using the train.