Romain's place is amazing. I can't imagine a better location, in the very middle of all the sights in Paris. In fact, we walked everywhere. The apartment is in a cool building right next to everything. The walk-up building was great way to get some exercise in between all the pastries and delicious food in Paris. We were in Paris during the heat wave, and although the apartment did not have air conditioning, it was never hot in the apartment. You can open the windows on both sides of the place which keeps the air flowing.
Romain was an awesome host. Incredibly easy to communicate with. I would totally stay there again!