I beleive the CZ.
I did it a year ago and never again!
GuaGua first, I believe in front of Pacos on El conde.
Then a carro. Not sure of the street. ( The Metro runs along the street ).
Then a motoconcho.
Too far....too crowded....too dirty....too hot!
Own my return I found a cab for 500 pesos, I gladly jump in it.
Maybe you could bare it, but I suggest TAXI!!!!!!!!!!!!!