One way to put it. As they say in the US, "location, location, location". Frederic is an awesome host. My wife immediately complained about why can't keep our place like Frederic's apartment. :) Ignore the 5th floor (108 steps..I counted) for a few days and you get a great place to stay. Frederic shared a laptop to complete a virtual meeting with a proctor for our COVID testing. The nearest train station (Château d'Eau) is a two-minute walk and fifteen-minute walk to Gare du Nord (North train station). We kept most of our luggage in lockers at Gare du Nord and traveled light to Frederic's apartment.