Agnes's apartment is a serene escape from the busy market streets and loud tourist-y areas, while still walkable to the Marais, Palais Garnier, Montmartre, and even (on a cooler day) the Louvre.
The apartment, itself, has a welcoming and artsy character with a romantic balcony. Amenities-wise, there is fast WiFi and excellent hot water/water pressure - the clothes and dish washers are a plus and the elevator is petit but essential!
Rue des Martyrs, a short walk away has excellent Cafés and specialty shops (jewelry boutiques, fromageries, boulangeries, patisseries, etc.) and the closest Metro line, the 12 - comes often and makes good connections to further-flung attractions.
Overall, we cannot recommend this stay more highly!