Thanks for the suggestions! Yes, Mexico city is the closest to Cuernavaca (about 1.5hr by car), and an easy day trip. It's much easier to monger in Cuernavaca, because it's a much smaller city (400,000 vs 24 million). At worst, you'll wait 20 minutes for the "mujercita" to show up, whereas a Mexico city commute can be up to 2 hours... The flip side is that's it's easier to find one in MC that speaks a minimum of English. In Cuernavaca, you're the one that has to learn a bit of Spanish
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What surprises me is that far smaller cities have made it on Eccie's list. I'll post to Mexico City, and let the OP move it!