I spent a week at Jean-Christophe's place near the Bastille and it was absolutely amazing! The location was perfect - there are tons of bars, and restaurants literally on the same street as the flat and the metro was just a short 5 minute walk away. Jean-Christophe is also a really great host and was really accommodating when I had to push check out back a few hours because of a flight delay. I'd highly recommend staying here if you're visiting Paris.