I stayed at Laurent's apartment for 5 days in February with my boyfriend. The unit is spacious with a cozy and homey decor. It also has useful amenities (oven, microwave, laundry, heating) for those staying for a longer period such as myself. It's located in a very convenient location next to Marais neighborhood and the Louvre, both about a 10 min walk. It's also right next to a grocery store Monoprix, and a metro station.
One thing that I wished I knew prior to staying at the apartment was that it was quite old, and not noise proof. The laundry machine was louder than I expected, and I didn't realize the noises would affect other units, so don't do anything loud and walk quietly in the evening and early morning (I had a bit of jet lag so was doing things at midnight and the early mornings, and disturbed the unit below).