The location of this apartment is amazing. It is literally a 3 minute walk to the Louvre and the Seine and a 5 minute walk from the Pompidou museum. It is very centrally located and close to pretty much every metro line, including the RER line to the airport. It is super close to Les Halles metro station, which is both a shopping mall and a huge metro hub. That being said, I almost never had to take the metro because I could pretty much walk everywhere. The apartment is a little price but the location is pretty much what you are paying for.
The apartment building is very old and charming in a typical Paris kind of way. The apartment is at the top level, which means there are about 5 flights of stairs that are kind funky (but I think that's part of the charm). There is a pharmacie, boulangerie, cafe (Pico), bao bun restaurant, wine bar (La garde robe) and a bunch of other adorable, more local neighborhood spots within a minute of the apartment. You can walk to the Marais, the Latin Quarter, Montemarte, and a lot of other quartiers very easily.
As for the apartment, I enjoyed my stay here for the most part. The only downside is that it can be a little noisy at night and the shower is super tiny (although most European showers are). That being said, there was always hot water. The apartment has a washer, a stove, a fridge, a microwave (no oven), a toaster, and an espresso cup machine. There are two beds that are very comfortable (one is a queen--a pullout couch-- and one is a full I think). It can easily fit 4 people to sleep. The furniture is a little bulky for how narrow the apartment is but it didn't feel overly cramped or anything. If you have any type of disability or problem walking, I would not recommend the apartment because there are a lot of stairs and inside the apartment the stairs are very narrow (it's kind of like a mini duplex). My favorite part of the apartment is the big windows that open onto the streets of Paris.
Nicolas was very professional and nice, he always tried to accommodate my requests as best he could including request for additional linens and helping out with mail.
Overall, I would recommend this apartment to anyone who wants a hassle free, relaxed airbnb experience in a cute little apartment to explore Paris for the first time or for the millionth time.