It's hard to remember because this was about a year ago when I first arrived but I think that I was paying 50 pesos per hour for both teachers and taking 2 classes per week (each class was 2 hours long) and the rental of the studio. Actually, now that I think about it, it might be worth it to run by the studio (that is if I can provide the right address). I think that it was Callao 86 (near the corner of Bartolome Mitre) in Congreso apartment 4B. It is an apartment redone into about 4 dance studios with mirrored walls. All of the teachers there rent out the space based on their students needs and most were teaching Tango classes but I am sure that the woman who rents out the studio time has numbers for many teachers. Sorry, I wish that I still had their phone number.