The official language is Spanish. Something to note is the use of vos (you) instead of the Spanish tú for informal treatment, and the use of che to address a person.
Currently, Buenos Aires receives tourists from varied nationalities that come for different purposes. Some come to shop, others to enjoy the night life and some others to taste the porteños bohemian lifestyle. Also, there are those who engage in an educational tour and want to study the Spanish language.
Several entities, academies, institutions and universities (among them the language Laboratory at the University of Buenos Aires) teach Spanish to foreign people, from beginner to advanced levels, or provide specialization on a specific field.
The porteños easily understand persons who speak Italian and Portuguese. Most people involved in tourist activities speak English.