Right across from South Station (red line, commuter rail, Amtrak). Driving and parking around there is going to be an absolute nightmare.

If you really want to live in the suburbs, consider one with a commuter rail that terminates at South Station (Needham, Natick, etc). You can still bring your car if you live out a bit.

Personally I'd live in Cambridge near a red line station and take that to South Station. Most areas are very walkable and you could always use car share if you need to drive somewhere.