I'm actually studying Spanish intensely for a few weeks, because I'm going to go check out Mexico City with the wife.
We just went there last summer. Don't miss Teotihuacan or the Anthropology museum.
The subways are safe, at least during normal hours on the tourist lines. Food is delicious. Even the locals strictly drink bottled water. Don't even brush your teeth with the tap water.
I can order food in Spanish but that's about it. My fluent wife was a big help but there are many People that are happy to practice their English to help you with directions.
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