.... Guys should I just create a proper timeline rather than use this half timeline half challenge question page?
This thread is turning into an ironic joke...By the way, what town/city is the best location for this new Roman Kingdom?
(It isn't a joke! Just quiet! Please, give us moar!) - Town/City as location? I assume you mean as capital? In terms of administration, Ravenna is probably best, considering its location is well placed for Italy historically, and has easy access to both the Adriatic (and thus the oddity of Venice), and the Po Valley. As such, most of the Kingdom.
Symbolically, Rome would be great, but considering the Pope is based there, it leads to some constitutional weirdness.
Personally, I'd love to see Rome, but in practical terms, I'd suggest Ravenna, with permanent representatives from each duchy, and a Papal representative - each with their own permanent residences and offices.
EDIT : With the addition of Africa, there is a strong argument for a western capital as well, perhaps Siena, but I'm not sold on it as of yet. However, having a representative of Africa in Ravenna as well that represents Carthage et al would be a good idea.