What makes you want to visit Medellin?
It depends of what you want...
Women are indeed beautiful, night life is great, there is "Parque Lleras" the principal party spot in the city, that's where most of the locals and expats hang out, there a lots of hostels around also, you will find everything you need within a walkable distance.
Weather is just perfect, warm but not too much, all year long.
The city is smaller than for instance Bogotá, so it's easier to move around, although traffic can be a pain in the butt during rush hour.