In December of 2015 I took my second trip to Paris. My first was in 2000, and was only a weekend hop from Germany where I was working with a client. This visit had a tremendous impact on me. What they say about Paris is all true, its beauty, its atmosphere, and its people -- scratch that. What a lot of people say about the French, that they are snooty and abrupt with foreigners, is not true. I found most of the French in Paris to be warm, helpful and a joy to be around.
Anytime is great for a trip to this city, but December is kind of special because the city, particularly, the Champs Elysée, is decked out for Christmas. It's not too cold, although it can be a bit rainy, so the weather is conducive to walking, which is generally the best way to see the city. Bring good shoes and take your time.