Carmen and José's place is beyond great. We had the luck to book there after a terrible experience just before and ended-up sooo much the better. The kitchen has by far the best view over Paris I've been given to see in many many Parisian years (to experience that view only, the flat is worth queuing for). The hosts were so reactive and available, all was top class really.
And the bonus is, in that building, judging by the intercoms, u have a lot of famous neighbors) :)