I made the barrio transformation tour with a guide named Diomer. Diomer spoke perfect English, was very nice, and was very, very, very interesting. I could not stress that point enough. Listening to him was very pleasant. The tour lasted slightly longer than expected and when it was over we felt like it was too short. The tour is not only about the barrio itself, it talks a lot about Colombia and Colombians as well.
One of the best tour in my life.
I also made the free Medellin walking tour and it was good