The elevator wasn't working, it seems for a long time now, so you will have to walk up to the 4th floor.
Location is excellent. It is close to Gare d est and gare du nord.
There are lots of patisseries near by and a supermarket downstairs.
The apartment is "unique", all the furniture in the room is for display only (chair broken, sofa sunken in etc). The place smells of cigarettes, linen included. There is A LOT of stuff everywhere in the apartment.