Ive been on many tours and all of them were done as a group, until this one. When we were doing our research before coming to Buenos Aires, we came across this Tour Guide (Pedro Werberg is the Tour Guide). This full day personalized tour was priced $70 USD for two people. We thought this was expensive, especially since we could probably get a group tour for $20 each, so total would be $40. But we thought since it was a private, it would cost more.
It was TOTALLY WORTH it!! You could go anywhere you wanted in the city, but of course, its probably better to listen to his suggestions. However, if there was something that you have in mind to see, he could definitely take you there as well. And you take as long or as little time you wanted at each tourist site. Thats the beauty of have a private tour guide. And I forgot, Pedro, is very fluent in English, has a great sense of humor, really nice, and can talk about other stuff, other than the city stuff. He knows a great deal of the history or Argentina as well. The money that we paid was definitely worth it! Look at my name, Ghetto...that means, Cheap, Frugal, always looking for a deal, but in the end, I still would do it all over again. I loved Pedro as my tour guide, and recommended him to a couple of friends who went there as well. Oh yeah, when we were taking a break from walking, he even took us to a local coffee shop called Havana, which had the most yummy chocolate covered bake good, and then he TREATED (paid) for the meal!