Hi PoseidonM, welcome to OpenStreetMap :) I'm one of the volunteers in Greece.

Thanks for improving the data :) I noticed that you asked for a review of your changes. Is "Politeknon" how the street name is written on the street sign..? 

If yes, my suggestion would be to change "name=Politeknon" to "name=Πολυτέκνων" + "int_name=Politeknon". To do that, select https://www.openstreetmap.org/way/621681598 > edit> tags (from the column on the left) By pressing "+" you can add the key "int_name".

For more information about transliteration of names in Greece see https://wiki.openstreetmap.org/wiki/Greece#Names 

If you have any questions, feel free to ask here, at the forum for Greece https://community.openstreetmap.org/c/communities/gr/68 or at our Matrix channel https://app.element.io/#/room/#osm-gr:matrix.org (a Matrix account is needed for that one).

Thanks again for improving the data and have fun mapping! :)