Nice, clean apartment. Well kept, with plenty of amenities. Beds were comfortable, and the kitchen was well equipped.
Good location if you're OK with taking public transit or walking. It's close to bus and metro lines (plus trains from Gare de l'Est and Nord), and it's not a terrible walk to Ile de la Cite. Although it's on a very busy boulevard, the noise wasn't terrible at night because the apartment is in the back of the building.
Overall a great stay in Paris.