This was truly a wonderful experience for us. First, Nico was a fantastic host - he had great communication, it was easy to meet up to get situated, and he had all sorts of great suggestions for our short stay in the city. And his newly renovated apartment was amazing - a short walk to the Louvre and basically a block away from Les Halles, we were right in the middle of things. We had two young children, and we were really pleased with how quiet it got at night, we had absolutely no problems with noise. Great fresh fruit/vegetable groceries, boulangeries, restaurants, etc - anything and everything you need all within walking distance. The apartment itself was great - really high ceilings, plenty of space for 4 (including a cool loft nook where our children slept), and a really convenient and easy to use kitchen and bathroom.
We literally could not have asked for a better stay while visiting Paris, I highly, highly recommend both host and apartment for your next stay.