This truly is my very favorite location in all of Paris: close to everything! I stayed here with my daughter, son in law and their two year old and we couldn't have been happier. True, the apartment is compact. But it has everything you could possibly need, including things that made our little girl very happy: comfortable area to play, crib, high chair, and protection against any sharp corners on counters to keep her safe. It's an extremely well thought out little apartment -- very clean with great lighting and a wonderful draft should you want some cool air. I mention this because we were in Paris the last week of May. An unusual heat wave pushed the temperatures outside to over 90F. We could have used the fans that are stored in the apartment, but we didn't have to. There are shutters and a two-way exposure allows there to be a delightful breeze.
I should also say that every email I sent (with numerous questions, especially concerning supplies and arrival times, etc.) was promptly answered. I'm in Paris several times a year so I know the city well, but I don't really know the local tricks and favorites for young children. I got some wonderful ideas from the owners and I'm forever grateful for their helpfulness.
One comment: the apartment is on the first floor. It faces a quiet street (and a courtyard for one of the bedrooms), but if you keep the windows wide open, you're going to hear the hum of happy diners in the evening. (But by 11 it all stops and there is complete silence.) Too, in the morning, you'll hear the city waking up. Not a problem! There isn't significant car traffic here and during the night (and afternoon!) hours, the place is really very peaceful.
In sum -- a terrific place to stay! It was a beautiful and memorable eight day for us!