Where did Carlisle live before he became a vampire?

London

Carlisle lived in London. He was the son a pastor. His father hunted vampires and other creatures. As his father grew older, Carlisle took over his work and was bitten by a vampire. Because although his father was more obsessive, Carlisle found real vampires. Unlike his dad.
So... he was changed in the age of 23 around 1663.