A friend and I, and 3 kids (8, 9, and 10 years old) stayed for 6 nights at Celia's and Michael's place and we had a great time. The apartment was clean, small but comfortable, functional, and well decorated. The photos are very reliable to what to expect on how the place looks like.
The best things.... Micheal was very quick in replying to the messages and making sure we were all settled fine. The location was not top, but it was ok. The subway was right on the front door! It was very convenient. There were also 2 grocery stores steps away... and having the option to go and quickly by stuff to prepare for the kids was awesome!!!
There were 2 things a bit on the down side... during our stay, we got really hot days in Paris and we learned that the apartment only had fans (no AC). It was hard to fall sleep being so hot. Can't imagine being there during summer without an AC. We thought about opening the windows as to try and refresh a bit further, but we also found the area (and the upstairs neighbors) a bit too noisy! So... we gave up on that idea.
I do recommend this place, mainly for the host (Micheal) who was very nice in replying and allowing us an uneventful stay, and also for the super easy access of this apartment to everywhere in Paris!