I m from surat and I sometimes visit the Mumbai for different purposes. I found that mumbai has very bad areas except some areas like bandra, malad, juhu etc.
Dharavi is not pride of mumbai but it is shame of mumbai. There are all type of bad people there. Most of the smugglers leaves in dharavi. It is difficult to visit us in dharavi. All the thief leaves there.
And also about local train. I am very much hesitant after seeing crowd in local train. I do not have guts to travel in local of mumbai.