Fantastic apartment. Amazing location (just a 15 minute walk to the Louvre, close to several key metro stops). Easily fit 5 adults and two pre-teens for a 4 night stay. Beds were comfortable. Flat was very clean. One small thing to be aware of - it is located in a busy neighborhood so at night it was a bit noisy, so you might want to bring earplugs.
I highly recommend this flat and will definitely book this again