The apartment is great!
The location is cery central and in walking distance from many of the main attractions (eg Louvre, Mousèe d'Orsay).
Everything was very clean and the apartment is just like in the photos. It's spacious for the standards in Paris, so I really think you won't find a better price to value ratio.
The hosts were very kind and available (they lent us a corkscrew and let us leave our luggage in their office after checkout).
I highly recommend it to any couples visiting Paris!