My classes are usually one-to-one tutorials (private tuition). Occassionally there are mini-groups with two or three students. For firms and other organizations I also offer group classes for their employees at work.
I graduated from Munich university in German as a Foreign Language, M.A. (Only to avoid misunderstandings: Of course I am a native speaker of German). I have given a lot of German classes in many renowned schools, e.g. the Goethe-Institute and the University of New South Wales, Australia. References will be provided upon request.
I work for myself, therefore my motivation to give really good classes is much higher than of some completely underpaid teacher who works for a school (severe underpayment is unfortunately normal in this business). Here, the boss teaches herself!