What better way to arrive in Buenos Aires, tour the city, and be taken to a milonga than in New Yorker Fred's Silverstarcar Service! He now has a fleet of 3 luxury cars to do your bidding. Take advantage of low season prices now and try it. He and his staff/drivers all speak English, and I can personally affirm that they are nice and fun people, and the cars are G O R G E O U S! His Lincoln Town Car can comfortably fit 4 people inside with all their luggage in the trunk for a comfy airport pickup or delivery.
My friend SallyCat and several of our students have used Silverstar and highly recommend it.
(P.S. No payola was involved in this post; I'm recommending Silverstar because I know what a great service it is from what users tell me, and I know Fred. For Ruben and me, we go to the milonga in his batata!)