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Hello. Thanks for the note :) The restaurant probably belongs to the nearby hotel with the same name "Olympia Palace" and was mapped separately. I have moved it near the hotel (https://www.openstreetmap.org/changeset/55170798). If you know the area that the hotel covers, feel free to trace it. You can also improve the map yourself at www.openstreetmap.org - most changes are immediately visible on the online map (refresh your browser to see them). Happy new year :)