San Francisco isn't uniformly dense and narrow, but it does have both, and it's run remarkably well so far.

What would be an example city? Waymo just announced they're ramping up in Boston: https://waymo.com/blog/?modal=short-back-to-boston

"we’re excited to continue effectively adapting to Boston’s cobblestones, narrow alleyways, roundabouts and turnpikes."

I live in such an area. The route to my house involves steep topography via small windy streets that are very narrow and effectively one-way due to parked cars.

Human drivers routinely do worse than Waymo, which I take 2 or 3 times a week. Is it perfect? No. Does it handle the situation better than most Lyft or Uber drivers? Yes.

As a bonus: unlike some of those drivers the Waymo doesn't get palpably angry at me for driving the route.

Yes, something like Ho Chi Minh or Mumbai in a peak hour! With lots of bike riders, pedestrians, and livestock at the same roundabout.

Like London? https://www.youtube.com/watch?v=KvctCbVEvwQ

Waymo cars are driving around London right now.

Not taking paying passengers yet though!

They're being trialled in London right now.

Napoli

Old Delhi is the the final boss.

Does it, though? Maybe Dhaka will never get Waymo. The same way you can’t get advanced gene therapy there.