Gillian was really accommodating, and let us leave our bags in the apartment as our flights were early morning. She was also very quick to respond when I emailed a query while we were there. The area is fantastic!! Straight walk down to the Right Bank, Centre Pompidou, Louvre and Notre Dame - plus, great vintage shops along the way.
Lots of bars and restaurants around the apartment, especially on Rue St-Denis. Great bakeries nearby too!
Apartment is small, but we fit very comfortably with 5 - two on the couch beds, one on the day bed, and two in the double up in the mezzanine.
You would definitely need to be comfortable together, though, as you're sleeping very close. Enough room to eat breakfast at the table together straight from the bakery every morning! That's all we needed.
Easy check-in, and great area. Would really recommend this apartment.