Hi Ken:
This from wikipedia:
There are many brownstones throughout numerous New York City neighborhoods, especially in the Brooklyn neighborhoods of Park Slope, Clinton Hill, Fort Greene, Cobble Hill, Prospect Heights, Brooklyn Heights, Bedford Stuyvesant, Sunset Park and Bay Ridge The Manhattan neighborhood of the Upper West Side, too, retains many brownstones. New York City brownstones are highly desired, and usually cost several million dollars to purchase.
My pick would be the Upper West Side. The impression I got from the show was that the brownstone was about 100 years old (so ghosts lived there) and was not attached to the adjacent houses and had a small back yard. Most brownstones in New York are attached and comprise a whole block. I get the impression that Metropolis is a little less intense and pack city than New York.
Hope this helps.
r/
Artemis