I agree with you, mos_next_door. The rule is to use the local language, Greek in this case. I made a mistake because I thought that the iD suggestion was correct. In a quick look it appeared to be good. I fixed it in changeset #180893735. Sorry for modifying you edit with a mistake, and thank you for reaching out to tell it to me.

Hi Layft Greater,

I just realized that we both describe address numbers in a different way. You separate numbers by semi-colon (example: "1;2"), and I separate numbers with comma (example: "1,2"). I am following this approach (the "most popular"):
osm.wiki/Addresses#Buildings_with_multiple_house_numbers

Why do you prefer ";" instead of ","?

And perhaps we also follow different approaches regarding how to assign a postal code to a street I add "postal_code" tag, but perhaps you prefer "addr:postcode" tag. My approach is based on avoiding warning in GeoFabrik:
https://tools.geofabrik.de/osmi/?view=addresses&lon=33.35387&lat=35.15693&zoom=18

Do you really prefer "addr:postcode" instead of the "postal_code" tag?