There is almost nowhere in the old city that will take an unmarried couple. The hotels inside the walled city are small, family-run and frequently will not, at any hour. So the arrangement that works is that she meets you here and the evening happens in Paharganj, fifteen minutes west, or Karol Bagh, twenty.
That is set out on the Chandni Chowk page as well, because somebody booking blind would otherwise find it out at a reception desk. One photograph on this page. Hindi and English besides Malayalam, five foot four.