We did the tour of 3 hours in Buenos Aires, our guide Mariela was great, her English perfect, she has a lot of knowledge and answered any questions we had.
She explains with a lot of detail.
The tour takes you to the most Tourist places, let's call them like that.
The tour takes you to San Telmo,Boca & Palermo , the 3 most notorious places in Buenos Aires
Over all the tour is recommended, and hopefully you will do it with Mariela and enjoy it like we did.