There are plenty of different ways to get from Ezeiza into town, but if its your first time to South America, or if your Spanish isnt too great, or you simply just want to take the easy option ... i highly recommend that you give Fred a call, he is a native English speaker who knows BA like the back of his hand...he will pick you up and drop you to your accommodation hassle free... Give him a call or check out his website at
http://www.silverstarcar.com ... he made everything simple for us and even offered to show us around town.