Looking to vacation for a week in London and a week in Paris. We have two category six hotel stay certificates and we are not sure which hotel to stay at. We are considering the Kensington, Maida Vale or Regents Park in London. We are considering the River Gauche and Renaissance Paris Hotel La Defense in Paris. Hotels have to be category six or less. Would like something close to public transportation. What is the best way to travel between London and Paris, train or plane? Any ideas on hotel stays and travel between the two cities?