would recommend!

I stayed in Buenos Aires for 6 weeks during summer vacation (winter in Argentina!).
living – The living conditions were great! My host mom was very friendly and always asked me about the program activities. Food was delicious. The bathroom was tiny but functioned fine.
activities – Activities almost always remained within Buenos Aires. Aside from the tourist must ranch excursion + asado, activities included neighborhood tours, museum visits, cultural classes (tango, cooking), and Maté Club (practice Spanish making small talk w other ppl).
classes – Classes improved my Spanish a lot. Compared to U.S. classes, a lot more emphasis is put on speaking skills and immersion (for example, explanations are mostly in Spanish). I was put into a lower level (2) than I had already studied in the U.S. (3) due to my lower speaking skill but moved into 4 by the end of 6 weeks.
complaints – My director was super chill and friendly! However, he often arrived late to activities, which eventually became frustrating after multiple incidents. Also, sometimes the activities didn't seem planned out very carefully or in detail, and some were delayed or canceled as a result.

tl;dr –
I loved the trip; it was a lot of fun; I learned a lot of Spanish. I would recommend the program if your main objective is to improve Spanish. Students remain within Buenos Aires; despite several tours you will not be visiting Iguazu Falls, Patagonia, or other famous areas of Argentina with Sol Abroad. Remember that you will only get as much out of the trip as you put in! Make an effort to immerse yourself in the culture/language.