As others said, the personality of the individual chicken can vary quite a bit, regardless of breed. We've all had different experiences. I think quite a bit of it depends on how they are raised. A chicken raised in a brooder and handled daily will likely turn out a lot friendlier than one raised by Mama with no handling. You can increase your odds by selecting certain breeds though as certain breeds are just wild. The Henderson Chart is a pretty good place for information on pure breeds. I'd look for both docile and takes confinement well.
I don't have sex links, just the breeds in my signature. Of these, I'd suggest the Delaware or Orpington for you, but that's from my experience. It could easily be different with different individuals. With your circumstances and desires, in an urban area and wanting friendly egg layers, I'd suggest you look at the sex links. You probably don't want roosters so this gives you the best chance of not getting roosters and they can be very friendly and mellow. They have something called hybrid vigor which tends to improve their performance and could make them healthier and perform better, including in the egg laying department. For a small urban egg-laying flock I just have trouble not suggesting the sex links.
Good luck.
