Hola everyone, As a reply to breibach, and an update...yes your idea of switching trains at Mar de Cristal to or from line 4 is a good option and is a convenient way to get into the city since if you came by bus (which is an ok option too) you probably would still have to get on the metro at Av. America to get to your hotel anyway.
I just took the bus they have between M on Wednesday June 7th and it was very easy and well marked (look for the busses with the letters "SE" , they come quite often, for me there was no line going from Colombia out but there was a line at Mar de Cristal, but with two busses coming at once sometimes its pretty quick. The trip itself is not fast as the metro of course but ok if you need to go that direction. I would opt to just transfer at Mar de Cristal to the Metro line 4 to go into the city.
J.