Looking for an exercise and grammar book for greek as a second language - intermediate level (B1+)?

I am right now in Athens and looking for a bookstore that offers books for greek as second language. Books including either grammar or exercises are w

I am right now in Athens and looking for a bookstore that offers books for greek as second language. Books including either grammar or exercises are welcomed. It doesn't make a difference to me, if the book is completely in greek, it would however be nicer if it was partly in English/German.
Can someone recommend a good store, which has a nice variety? Especially a bigger selection than only A1 level.
Thanks in advance

or:I am right now in Athens and looking for a bookstore that offers books for greek as second language. Books including either grammar or exercises are welcomed. It doesn't make a difference to me, if the book is completely in greek, it would however be nicer if it was partly in English/German.Can someone recommend a good store, which has a nice variety? Especially a bigger selection than only A1 level.Thanks in advance

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