To reach the lower town you either take the funicular from the Dufferin terrace for 5 CAD one way/per person (the entrance is located inside the glass square houses right near the statue - don't forget to press on the door to access this area) with the capacity of the funicular of max 6-8 people and going every minute, reaching the old town in 1 minute.
The other option is to walk all the way here, if you have the energy, and immerse yourself in more touristic attractions with lots of over prices cake shops/ice cream shops/nougaterie or restaurants and fashion shops far detached from the French or European fashion though.
Cobbled streets located near the water, the ferry not far from here, a gorgeous piazza with people watching as in the style you find in most of Med countries, if you are fortunate to be here on a sunny day.