In India, when you hire a car you automatically get a driver included - which is a very good idea as I personally would not recommend driving in such a hectic town, especially if you're used to northern European/US traffic.
This is an ideal way to get from meeting to meeting, as the driver is at your disposal all day and will come and go as you require. It also works out to be a cheaper alternative to booking individual taxis, especially if your company has a set rate with a particular hire car company.
Major hire car companies such as Hertz, Avis, etc.
If you're just in Mumbai for the day, passing through, stay at the Leela. It's a good five-star hotel two minutes from the international airport. Mumbai is a fantastic city but traffic can be a problem so if you don't have to journey into her, don't.
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