Scaled up quad-copter
This is just a concept at this time, they've not flown it with a real person inside.
To be viable, the blades need to be enclosed, and there needs to be a shed load more of them. It needs to be drivable so that it can move from the designated roof top landing spot to a charger for the return journey.
It also needs to be able to carry one or two people, and properly distribute any ballast without user control. During flight it'll have to follow current roads, no-one wants them making an emergency landing in their yard, but onto a normal street could be possible.
Autonomous cars may be a dead concept already, replaced by a viable autonomous flying vehicle instead.
Now if only I had invested in building a really large battery manufacturing facility, and had expertise in high power electric motors and drive systems. Over to you Mr. Musk.