Hi nicolas,
I did all the things you said but i could not get the result i wish.
Remove the text in the "SEF product name" setting and that will remove the "product" part.
That worked fine.
Turn on the "remove category and product ids from URLs and that will remove the 1- part.
With that setting to YES i get the message "product not found".
Then, remove the product alias and make sure that you activate the unicode SEF setting of your Joomla configuration and the SEF system will use the product name with the greek letters and you'll get the result you want.
Done, but i still get english characters instead of greek (.../2-agoranomiki-diataksi).
I removed the canonical url. I will sent you admin if you can check it?
Thank you