The location in the Marais is ideal. When you walk out the gate, you are right in the heart of the Marais and all its bustle and activity. There are certainly quieter, more residential neighborhoods, but if you love the Marais, then you'll love the location. The one-lane, one-way street can be a tad vexing when trying to load/unload bags, as impatient drivers quickly get backed up and start honking.
As advertised, the apartment does not have any windows, so we kept the skylight open as much as possible for air flow. The skylight is definitely a creative way to get some natural light and fresh air into the unit.
We were five people, and it was a bit cramped. I think four would be more suitable. We are also not light packers, so the space was a bit of a challenge for us.
All in all, I would recommend this place for a short stay in Paris if you want to be in the Marais and plan to spend most of your time out and about exploring and enjoying Paris !!