You wouldnt be able to think about a better location to stay than the Île Saint-Louis. It is were Paris was originated in, and one of the most charming places I have ever beem! You feel like you are in an isolated and quiet village and at the same time you realised that you are in the center of Paris.
The apartment is small-like shown in the pictures- but it has got all what yu could need. Anne-Laure made her best to make my stay wonderful.
I definitelly recomment that place, and I will stay here whenever I will return to Paris!