A great option for a short stay in Paris! We stayed 5 nights with our two children. Easy walking distance to lots of shops and restaurants. The Monoprix a couple blocks away also has a large and handy grocery in the basement (took us a couple days to discover it). The check-in/out process was very easy and clear.
The only downside was some early morning construction work on the building next door and some loud party goers across the courtyard one night. As to be expected in a neighborhood filled with bars and shops. Otherwise, having the apartment facing the courtyard is a plus, as you hear very little street noise.
We would certainly book again if staying in Le Marais.