@Zephyrum: Okay, I will up Novgorod. I'm also happy to add Venice, but what value do you think it should be? As for Ethiopia, good point, I will look into it. Finally, I'll consider Athens, but it may be bad for balancing to have it.
For Venice, at this time, it was still growing, so a 6~8 should be fine. 7 maybe?
As for Athens hurting balancement, I really don't think balancement should be the focus here. A good scenario maker will be able to make a template by nerfing and buffing bonuses; the more cities you represent, the more versatile is the map.
I for one have a really hard time making a game with Bulgaria in the 30YW map due to the lack of cities in it's region.
And the greek region is completely desolate despite being quite rich at the time.