Stayed here for 3 nights with my girlfriend and had a great time. Apartment is really easy to get to. One train from Paris Airport to Gare du Nord (takes about 30-40 mins) then it’s a 10-15 minute walk from there. Flat is 2-3 minutes from the Metro, 10-15 from Gare du Nord, and 10 minutes from the beautiful Montmartre. The location can be a little intimidating, but the flat itself is lovely - perfect for a couple!