Native Greek speaker in Istanbul?

I am a Turkish citizen who lives in Istanbul, and I am thinking about starting Greek. Teaching and/or teaching materials can be in English, Turkish, or in any other language. 

Classes with 4-5 groups or private class is acceptable. I prefer native Greek speaker to provide me completion of A1 and A2 levels. I do not insist on private language class, native Greek teacher can even add me into his/her existing group classes in a language course.

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