This apartment is located in a very unique covered passage in a great location. It's very close to the Opera, an easy walk to the Louvre and Notre Dame, plus there are several Metro lines and bus lines within a few blocks. As other guests have noted, there are narrow and steep stairs to get from the ground floor up to the first bedroom/bathroom, then another set of stairs to get to the living room/kitchen, and one last flight of stairs to get to the top bedroom/bathroom. There were six of us - 4 adults and 2 kids - and by Paris apartment standards we had lots of room. The sofabed in the living room was pretty comfortable, though once it is open there is really no additional room in the living room area. A couple of things to note: the shower in the top floor bedroom is very very narrow and small, difficult even for me (I'm 5'2"!) to turn around in. Also the top bedroom is actually loft-style so there is no door to completely close it off from noise and light downstairs. If it is really hot in Paris, as it was when we were there, there is no air/con and the top bedroom can get quite warm. There is a powerful fan up there so that helps a lot. The kitchen is clean and modern, but definitely not really stocked for any sort of cooking or real food prep. We couldn't even find a knife other than the butter knives. There was no hand dish soap so if you use just a couple of dishes, there isn't a great option to just hand wash. But there is a dishwasher!
Overall, we had a great short stay. Loved the fact we were in this historic covered passage. Super quiet at night. Location is excellent and worked out perfectly for our family.