Frédéric place is very well decorated! We were impressed by the decor and how the apartment was laid out to maximize storage. The kitchen had everything we needed and we appreciated that there was a laundry machine as well. As others have noted, the walls are pretty thin so you can hear other neighbours at times as well as the restaurant downstairs. That being said, I slept at around midnight each night and woke up around 8/9am so I didnt have a problem with the noise, even though I'm a pretty light sleeper. If noise is a problem for you, I would recommend bringing earplugs :)
We really enjoyed our Stay at Frédéric's place. Theres many fantastic bakeries nearby (Utopie, Mamiche, le pain et des idees) and we loved how close we were to the shopping area of Marais (15-20 mins walk). If you love baked goods and shopping, then this apartment is in a great location. If you're also looking to run in Paris, it's around a mile and a half (10-15 mins) away from the Seine.