You may want to consider a small barrio located between Palermo and Belgrano. It was recently rated one of the safest in Cap Fed. Called Colegiales, where many schools are located and many affordable family style homes. We visit friends who have lived there for 4 years. They say it is quiet, safe, friendly, centrally located, no stinky smells or night noise from restaurants or bars unlike parts of Palermo or Recoleta. As with many big cities, you must keep alert, dress down & know the current scams. Believe you will find what you are seeking here. Best of luck!
