We visited the apartment for ten days and recommend it. It's close to half a dozen train lines as it is more or less at Chatelet and within a short walk of the Seine, the Marais, the Left Bank and just a few blocks each from Louvre and Pompidou. The neighborhood is lively day and night.
The apartment is clean and beautiful, with a full kitchen, full bath and half bath, comfortable bed, washer/dryer and TV/wifi. Lots of light from the windows, too.
Eric is friendly and responsive. When we were a bit later than planned on arrival, he was still able to meet us on just a few minutes notice.