We had a booking cancelled at the very last minute and were on our way to Paris for three days with no where to stay. We instant booked this flat with Zazie and she confirmed really fast and as we were driving to the train station we found we had a place to stay. Zazie is a great host and was very accommodating, going the extra mile to make sure that me, my wife, and my 2 year old daughter had everything we needed; even making sure we had yogurt, a bib (a sentimental one that she used with her daughters years ago), and even borrowed an infant mattress. We couldn't ask for a more exceptional host.
The flat was lovely, clean, and located perfectly along the purple metro (Gare del Est, the major train hub) which made it easy to get to all the major Paris sights in our short 3 day stay. We were extremely thankful to have a place to stay, the flat is more ideal for 2-3 adults than kids. The bed was comfortable. The couch/futon was not (not even for sitting). It makes all sorts of noises and I don't think anyone could sleep on it through a full night. This flat is perfect for a couple adults and functional for more but not ideal.

If you're over 6'1 your knees will hit the door when you're using the bathroom. Wasn't an issue for me but I could see taller people having a problem.