We had a great time staying here. The location is wonderful, right on the edge of Marais and a block from the Etienne-Marcel metro. The host was responsive and accommodating, and the welcome gifts -- champagne and chocolate and orange juice and water -- were very much appreciated! The apartment was spacious and well-decorated, and we had everything we needed.
No real negatives, but be aware that the place overlooks the very busy Rue St. Denis, and on weekend nights (even late September when we visited) it will be noisy until 2 or 3am outside the windows. But that may be a good thing if you like the street scene!