Both the apartment and location are terrific. It's on a quiet street above a chocolate shop, yet is only 20 feet or so from a small, but thriving street with lots of restaurants, boutiques, and small supermarket. When you close the bedroom door, though, it's totally quiet. Two metro stops are very close. If you want to experience Paris as Parisians do from an apartment on the Rive Gauche (St. Germain des Pres neighborhood), this is the place for you.
Julien was terrific. He is very friendly (what the French call "sympa"). He is also very easy to deal with regarding early check-ins and holding luggage after check out.
The water pressure in the shower is terrific. My only concern was that the base to the shower controls (the pipe where the hot water comes in) is extremely hot, and my wife accidentally touched it and burned her arm. I have advised Julien that this should be covered or otherwise handled.
Overall, this place deserves its five stars.