I am a regular visitor to Paris and know it like I know my own home town. I can tell you: This is a great location!
The apartment is clean as a whistle. Comfortable bed. Great shower. Very secure building with a steel door on the apartment and an access code and secure door on the building itself. Felt very safe! Street gets very quiet after business hours. My sleep was never interrupted even once over a four-night stay. Five minute walk to lively cafes on Monorgueil and near Châtelet, Louvre, Palais Royal. (So lots of lively nightlife and lunch/dinner spots nearby.) Several Vélib’ (city bikes) stations within a two-minute walk, and if you’re willing to bike, half the city - Opera, Vendôme, Left Bank, St. Michel, Odéon, Luxembourg Gardens, Orsay - is 10-15minutes by bike. (Highly recommend using city bikes, as Paris is very bike-able and drivers are respectful of bikes. More fun than a cab and definitely beats the metro!) Numerous nearby metro stations. Lots of nice cafes in a minute’s walk. No AC, but fans kept me plenty cool. (Only wish is that there were a TV - but that’s a minor detail. Used my tablet and the very reliable wifi.)
I kept Jean-Yves (host) informed about my arrival and then again about departure. He was easy to reach, responded each time within minutes, and met me at the door at my arrival. He carried my suitcase to the 2nd floor (premier étage) location, which he didn’t have to do, showed me around the apartment, and gave good advice about nearby attractions, restaurants, and businesses. He was also flexible with me at departure. (My flight was delayed at the last minute, and he had no problem when I asked to change my departure time.)
No complaints at all. Au contraire! Love the combination of quiet area at night with the best of Parisian city life so close by! Would stay again.