We thoroughly enjoyed our stay in Clément's flat.
If you know and like the East End of London, then you'll find lots that's familiar about the area: not the most picturesque Paris has to offer, but full of great cafes, bakeries, vintage clothes shops, and upscale fashion boutiques. The Marais and Bastille are within walking distance, or just a short hop on the bus.
Inside, the flat is as it appears on the photos - spartan but comfortable - and all, apparently, hand-made by your host! Heating works well; plenty of hot water, and a good powerful shower. Also (if you have long hair, this may be useful to know), there is a hair-dryer!
Clément was a charming host, quick to reply to my messages, and there in person to meet us on the day.