We had a wonderful time staying in Nicolas’s place in Pont Neuf. You could not ask for a better location to stay. Close to both Chatelet and Saint Michel métros, you can go anywhere in Paris. And, of course, easy walks to the Louvre, Musee d'Orsay, Saint Chapelle, Notre Dame, and the Latin Quarter.
Nice but small kitchen with most everything you will need. We went shopping in the Latin quarter and ate in several times while enjoying the view and sounds of Paris. Living room is bright and sunny (when there is sun). A very arty space, which was wonderful. Bed was a double but comfortable. Maybe a bit hard for some people, but we slept well.
Nicolas met us at the apartment and was very gracious. He filled us in on everything.
Some caveats for some travelers:
There are 70 very narrow steps to the apartment (I counted). Thankfully, there is an elevator. However it's tiny; if you have claustrophobia, you won't like it. We used it with no trouble. Even if you use the elevator there are steps up and down each way to the apartment. People with limited mobility should probably avoid it. Try not to bring big luggage since it might be a tight squeeze.
In summary, If you really want to experience Paris, there really is hardly a better place to stay. Thank you, Nicolas!