I interned at their Mumbai office fairly recently. Honestly, had a great experience. Of course, there were some odd people. But that would be true for any place. And as an intern, you should try to focus on exposing yourself which makes AZB Mumbai the ideal choice, you tend to work on matters that the teams are actively looking at. Also, don't feel too disheartened if in the first week you get a lot of list of documents, just show them that you are willing to work and interest will definitely come your way.

Tip- Be a lil smart about who you take work from (after a couple of days you will understand some of your senior's patterns).