Location
You have to get out of the train station at Dunkirk and then find the address. The location is very close to train no 7 at Chateau Landon station. Metro is very easy in Paris (when you come from NY)
It took about 20 minutes to Louvre and it was very crowded Metro until about 1030 am
There is a small market around the corner, lots of nice restaurants and bakeries.
Apartment
Spacious studio that is cut by a metal/glass door, OK for couple or couple with kids. There is only 1 toilet and there is no privacy so I would not recommend to 4 adults.
Apartment is clean but not as large as it looks in the photo. Shower head and bed could use an upgrade. Can be noisy on the weekends (or we just had bad luck). Felt quite safe in the area and apartment. Large fridge, kitchen utensils, microwave, stove, dishwasher. There is a coffee machine but makes a lame coffee and there is some tea.
Host was very accommodating and always responding to questions very quickly. Very friendly. We did not meet him in person but communicated via airbnb site.