We stayed for 4 nights in Clément’s place. The location is excellent. Super close to the train station and definitely in a lively part of town. Whilst there are lots of bars and restaurants (we recommend La Ferme for a beer and charcuterie) , it was a quiet flat. We went in the depths of winter, but Clément has awesome heating. The bathroom even has a heater, which makes showering early in the morning not an issue. We did not use the kitchen except for water so cannot comment on that.
If you are there to see Paris and just sleep, then this flat is ideal. We had a few issues with getting keys (miscommunication on both sides) however it was fairly quickly resolved, with us waiting in a lovely bar for the keys to arrive.