This is kind of a funny question.
My first visit to London was in 1984. I stayed at a kind of awful hotel. I was able to put up with it because I was 20 at the time and I was just so happy to be there. However, one night when I was walking back to the hotel (it was dark) I was approached by a man in a car. The concierge told me Bayswater was a red light district. I had no idea.
Curious: Is this still true? Is it a safe area?
Thanks!