@Aron your experience at Vamos sounds terrible. I'd definitely recommend leaving honest feedback via a Google review. Now that you've mentioned it, I recall looking at a few of their Google reviews while I was still in Bogota and being turned off by some of their classroom photos, such as this one:
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The chairs do indeed look like something out of middle school, and certainly not comfortable for several hours a day. I would want a classroom that looks more like a co-working space (i.e. coffee shop vibes). I took some private classes from a similar "academy" in Bogota, and rather than sit in the classroom my profesora and I would go to lunch (to practice my restaurant ordering skills), or go for a long walk in a safe neighborhood and get "lost" taking random turns so I could practice giving and asking for directions. I found it a lot more interesting than learning in a classroom setting.
If your ML contact doesn't work out, I didn't think of it last night but there is a website called superprof (
https://www.superprof.com.ar/) where you can find profesores and instructores for all kinds of subjects, from math and chemistry, to music and fitness. I used the website a while back when I was looking for a fitness instructor. I just went there and searched for "Español para extranjeros" and there's over 2,000 results for Buenos Aires (some I'm sure with qualifications that are excellent, and others that are probably dubious). The thing I liked about superprof is that there is a rating and review system to filter the good from the bad. Most of the top results advertise that that your first session is free, and that they can meet you in a public place or come to your home. The "first session is free" offers would definitely appeal to me as being a low risk way to test the waters, and for me I'd only need 15 or 30 minutes to know whether the profesor/a is someone I would enjoy working with on a daily basis.
Here's a screenshot I just took:
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