This is a great alternative to stay in Paris. The apartment is fantastic, great spaces and details and well equipped. It's on the fifth floor with the elevator going up until the fourth floor, then stairs the last floor.
Very good location close to several Metro stations (Chateau d'Eau, Bonne Nouvelle, etc.) and shops. We came by car and a parking garage just down the street (under the New Morning club) was very inexpensive when booked in advance (€45 total for 72 hours).
Excellent and welcoming check-in. Friendly communication by the hosts! I recommend and definitely would stay there again when visiting Paris.