This apartment is lovely and quite spacious by Paris standards. The location is excellent, literally one block from Notre Dame. Walkable to Le Marais, Saint Germain and many other central locations. Excellent restaurants and patisseries right down stairs. Speaking of the stairs - just be aware as others have said that this is a five floor walk-up - pack light and prepare to get your heart rate up a bit! I just told myself that I’d earned an extra croissant or piece of bread each day (ha!). Paris was very very cold when we visited and the apartment can be a bit drafty, but there were ample blankets and a towel warmer to keep us cozy. The sleeper sofa was comfortable and functional!
Only small thing is that this is a lively neighborhood, so if you’re opposed to a bit of city noise coming in your window - this may not be this right spot!
We had a truly wonderful time and would definitely book this apartment again, or recommend it to a friend.