Constance & Emmanuel's was an excellent place to spend some time exploring Paris. It is in a good area, located very close to two Metro lines. There are plenty of restaurants and bistros within walking distance; not to mention the Chocolate Museum (definitely visit!).
The apartment itself was very clean and nicely appointed. The large kids room (with huge bunk bed) has plenty of toys to keep kids entertained when you're not out and about. The kitchen is well equipped.
Whilst there is a washing machine, there is no dryer. However a larger clothes hanger is provided.
The main bed is elevated (as you can see in the pictures) but the ladder is quite steep so people with mobility issues may have problems there. Likewise, the stairs of the building itself are also steep - and with no elevator - heavy bags and/or mobility issues may be a issue.
Finally, the noise from the bar downstairs on the street is very loud in the evenings. With the windows closed, there is no problem. But if its hot and you need the windows open for air flow, it is very loud.
We really enjoyed our stay and would stay there again.