Jonathan's place was perfect for our month long stay in Paris. Its central location makes it perfect to see the city or to take day trips by train throughout France. It's about a 2-minute walk to the Bastille Metro station where you can easily get most anywhere in the city or to the three major train stations (Gare d' Est, Lyon, and du Nord).
The place has everything you need for an extended stay - from cooking to laundry. The apartment seemed bigger than it is and Jonathan makes great use of the space. A lot of nights we'd cook dinner there, put on some music on the sound system, enjoy a bottle of wine, eat at the table, then watch some of the Olympics on the couch on our iPad. Was our home away from home.
One thing to note, if you're American (like us) is that the bed is a typical European bed. Which means it's firm or very firm with just a few pillows. That's very normal for France - we've stayed in European hotels before which have had a similar setup. It wasn't a deal breaker for us by any means, but just something to be aware of.
Finally, Jonathan couldn't have been a more wonderful host. He was super accommodating when our flight got in the early morning and when we made a change in the departure. However, one of our highlights of our trip was meeting him and his friend for some wine on Sunday morning after we got in and the tips he gave us. Go check out the markets and go walk up the canal!
If you're looking for a good place to say for a longer trip to Paris - my wife and I highly recommend Jonathan's place.