Advice on safety in Medellin.
Gents,
I echo those who advise both caution and encouragement re: Medellin. You should feel encouraged to visit. But you should always be cautious as a foreigner. Especially in a place like Medellin with evolving political / social norms. Your goal should be to go under-the-radar wherever you are. That means: dressing modestly and in-line w / the locals (save the flashy, trendy designer clothes for Miami or NYC) - don't go out wearing Prada sunglasses, blinged out watches, and snap-chatting on an iPhone X in el centro. Regardless of what time it is (but if you do this at night. You're tempting fate).
A lot of people get in trouble for not exercising common sense: they get a little too confident which leads to arrogance and start having el jefe fantasies where they feel like they are untouchable. You're very touchable, and just one wrong move from getting into a predicament where you bite off more than you can chew. You should also know that it's distasteful to overtly gawk and approach younger local women if you're an older gringo. It's frowned upon by the locals and you're putting a target on your back. Unless you're a veteran and have years under your belt in Medellin. Keep it simple: Be tasteful, be discreet, respect the local culture, stay low-key and abide by the local laws, always.