I did Levels A1, A2, B1 [formerly levels G1, G2, G3] in MMB Chennai.They are highly professional, excellent - and one can learn to speak German very quickly.
For those who are planning to visit Germany professionally, you should certainly consider MMB Chennai for a course in German. For those who plan future studies in Germany, there are quite a few universities [including the top ones] that have several good courses taught only in German.
The experience at the institute was awesome. I interacted with students from different backgrounds, and it was very positive. The exams were conducted in the most professional manner. The Library was awesome. Infrastructure was really good. Teachers were brilliant [teachers for all 3 levels I attended were brilliant].