Ask HN: What're some great cities to live for $2k USD per month?

I'm a single 31yo guy looking move somewhere new for 1-2 years. I'd like to have a studio/1br to myself, cook most meals, use public transit (no car), and have enough of a budget left for a decent social life. I'm pretty frugal by nature, but enjoy the odd creature comfort. Any recommendations for cities that would satisfy this lifestyle on $2k USD per month (net)? My budget isn't fixed, so can always go a bit higher, but would prefer to stay at/under $2k if possible. Thanks!

Some places I had in mind: Athens, Belgrade, Bucharest, Buenos Aires, Montevideo, Mexico City. Anyone have experience with any of them?