Additional info, my balcony faces east, and I live in Poland
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Poland has a variety of hardiness zones, which will determine how much longer you have in your growing season. I would suggest things like brassicas (which include kale and broccoli), as they can handle temperatures a bit below freezing. But keep in mind the size of your balcony, as they can get pretty big.
If you can buy seedlings of annual herbs like parsley, dill, basil, there's still time for a good harvest even in the colder areas of Poland. Do you have space where you can bring some pots inside?