The apartment was cute and cozy, just the right size for our family of four. Location is amazing, very close to Rue Mouffetard and within walking distance of the Jardin du Luxembourg. The apartment was clean, but some of the bedding (kids mattress, comforters) had stains on them. All in all it is good value for the price.
Check in process is a bit of a pain, you have to get the keys from a locker in a laundromat about a block away. The code we were initially given didn't work and we had to get in touch with the owner, who responded promptly. Actually, the communication is a bit confusing, I think it's not the actual owner but some other company that communicates with you through Airbnb. Towards the end of our stay we couldn't communicate with them as they had apparently lost access to Airbnb, but luckily we didn't need anything from them.