I stayed with a traveling partner and have to say Arturo's building is very safe with a security guard at the door 24 hours a day. The guards were also very helpful if we ever had any questions about the area, complex, etc. The apartment complex is beautiful with nice open sitting spaces, a kitchen, small gym, pool, rooftop view, and a washer/dryer. I would highly recommend this location to anyone as it is very close to the metro (which I also recommend using to get around) and locally owned restaurants. Arturo is quick to respond and was a wonderful host. If I ever return to Mexico City, I would definitely stay here again.
If you do book here note that when you arrive that the building is behind the little park plaza. The mural of the face with blue a geometric pattern (he has a photo posted) is the building you will be looking for with a black cast iron door.