This was a really wonderful apartment! The location is in a quiet area of Le Marais, but very close to the busier/livelier areas, so it's a great balance. The metro is next door, so it's very easy to reach the rest of the city. The apartment was clean, had a ton of natural light, had plenty of room, comfortable beds, and the landlady is very nice. Be sure to check out Le Bistro, the cafe just on the corner--we spent many early evenings there chatting up the friendly staff! There are tons of places to eat around the apartment that all feel very authentic.
The host was also kind enough upon our arrival to bring us a coffeemaker after we realized there wasn't one already in the apartment!

Only complaint was that Wi-Fi was pretty unreliable. If you're planning on working from the apartment, you might have some trouble. The bathroom also had a slight moldy smell but that was easily fixed with two air fresheners.
Overall, would definitely recommend!