If Copenhagen were a person that person would be generous beautiful elderly but with a flair. A human being that has certain propensities for quarrelling filled with imagination and with appetite for the new and with respect for the old – somebody who takes good care of things and of people.
Sometimes a character is really based on research that you do. Other times it's just based on your imagination or perhaps your conversation with the director. Or sometimes all of the above. It depends on the movie and character.