As you can imagine there are numerous schools that offer tango classes, workshops and private lessons in Buenos Aires. You will find the most amazing instructors there. However, because there are so many it makes it somewhat difficult to find the right one especially if you are there for a short period of time.
If your visit is under three weeks I highly recommend the following school: Escuela Argentina de Tango. I am not a huge fan of group classes for women (I think that they are far more useful for men). In my opinion it is better to save your money for private lessons and practice by going to practicas and doing exercises at home. However, this particular school offers classes that even I found extremely useful. Those are: Milonga con transpie, Technica para la mujer--postura corporal y adornos, Tecnica--naturaleza del movimiento and a special Saturday workshop Technica de mujeres para la milonga con traspie. What I recommend is that upon your arrival you visit the school, get the schedule (or get their schedule off of the website ahead of time) and just take classes for the first few days to get a feel for what types of classes you like and which instructors you like best. Classes are 30 pesos each and you can buy a discount card if you take multiple classes. Regular classes are 90 minutes and special workshops are two hour long.
When you know whose teaching style you like best talk to that teacher after class and sign up for private lessons. Private lessons are around 200 pesos for an hour of instruction and if you take more than three the price drops. Sometimes the studio rental fee is not included and will run you an extra 15 pesos--double check with your instructor. I highly recommend for women to take at least some lessons with a female instructor--no matter how good a male instructor is there are certain things you can only learn from a woman.
Escuela Argentino de Tango is located in Centro Cultural Borges which is located on the second level of Galerias Pacifico (a shopping mall). It is easy to find and is easily accessible by public transportation. It is quite convenient because if you are taking several classes in one day you can just take a break from tango by walking around the mall, checking out art installations in Centro Cultural Borges (on the same level as the school) or grab something to eat. There are several restaurants inside the mall and an amazing food court on the lower level. I was quite skeptical about the food at the food court until I tried it--it was absolutely delicious and prices very affordable.
Here are some adornos exercises demonstrated by Fernanda Japas (one of the instructors at the school) during a private lesson. Another instructor I highly recommend (especially for milonga) is Gabriela Elias.
