Thanks again for the many suggestions; I will explore some of those neighborhoods.
My first priority is getting to my favorite milongas quickly and easily. Also important is cultural/intellectual and social life. I appreciate the alternative suggestions, but commuting from a remote area is not giong to work for me.
I'm prepared for a trade-off to have a great tango life (which is unmatched on any other continent). But we can all agree that some city streets are much prettier and more pleasant than others. The rest of my year I live in Florida in a quiet, beautiful area, and walk 5 miles every day around sunset on a gorgeous beach on the Gulf of Mexico. I'll be okay in the city 6 months a year. But at least on a street that's tree-lined and not garbage-strewn, ideally with a few nice cafe's.