This apartment is fantastic, ideally situated right in the heart of it all!
It is close from several metro lines and less than 10mins walk from the RER B (extremely convenient coming from or going to the airports). Beautiful bakeries, cheese shops and Parisian bistrots are right down stairs. Most monuments and places of interest are within walking distance.
The apartment is quiet, well equipped, spacious and well heated. It is tastefully decorated. Laurent was very helpful and easy to get in touch with. Check-in and check-out ran smoothly. The late check-out (1.00pm) was great as it avoided us to carry our bags around half-day.
Just note that the sofa bed is not comfortable enough to sleep on for more than a night so I would recommend the apartment for two people sharing the same bed maximum. Also, the bathroom does not have any doors. It did not bother us but I'm aware it could potentially be an inconvenience for some.
I would book again this apartment with no hesitation and strongly recommend it for your next stay in Paris.