Really, you have to ask yourself, like any game, why do you want to make THIS particular game? When it comes to history, hopefully you see a setting charged with a lot of potential change, complex thought and conflicts to dig into, several cultures, and some relatively easy to grasp roles.
If it's because you think Victorian clothes go well with Changeling, you are choosing a historical era for the wrong reason. You forego so much of what modern thought about abuse and psychology has to say, for a hat. A damn fine hat, but only you and a few others will really get the hat.