We loved staying at Lana's apartment and I would absolutely stay here again. Getting to the apartment from Gare du Nord was an easy 15 minute walk. Lana was responsive throughout our whole stay. The apartment's views made the hike up 6 flights of stairs worth it.
The surrounding neighborhood has lots of cafes, bakeries, and shops. There is a small grocery store located on the corner which made it very convenient to get food to cook. Montmartre is so charming and artistic. Highly recommend.