I have 2 roosters in my current flock - a Svart Hona from Cedar Crest Farm & Feed and one of Dick Horstman's Bantam Barred Rocks. I have a walk in coop/run that I go into without worry of a rooster attack and regularly send my 9 year old in to gather eggs, feed, interact with the birds and he can pick either of them up. Both are incredibly friendly but if I had to choose just one, I'd take Dick's line of bantam rock because of the better genetics and such.
Dick Horstman is a member of these forums, or you can find him via google Horstman poultry.
Now, being less specific than those 2 resources, I'd still recommend getting your cockerel young and from a breeder rather than a hatchery for disposition. Being in an urban setting - have you checked local ordinances to see if roosters will be welcome or not?