We spent a week in Christian's apartment on the island. It was the perfect location for us. I have stayed in various districts throughout Paris, and the island has been my favorite. The apartment was a very comfortable size for my sister and I. There is a bed (on a loft) with a bathroom/shower. Downstairs has a sofa bed which was comfortable enough and there is a 1/2 bath (no shower). This gave us both some much needed space and privacy after traveling together for 1 week.
The cafes around the corner were great and reasonably price (if you do the prefix). It was nice to come "home" after a long day of touring and be only a few steps from friendly and delicious cafes. The island has 3 great cafes with plenty of outdoor seating (I preferred the ones by the bridge connecting the two islands), there 2 bakeries, a cheese shop, a wine shop, and a grocery store (what more could one ask for 2 minutes from your home).
Christian was friendly, helpful, and flexible. We got lost coming in from the train station and he came to find us on the bridge. He also responded quickly when we texted him with questions. The building itself was quiet and the apartment is on the ground floor. The stairs in the apartment to loft bedroom are a bit narrow, so keep that in mind if you have any issues with stairs (we did not have any trouble with them). Water was nice and hot. Cloth washer worked great and Christian supplied detergent (thank you for that).
The pictures, as with most pictures on rental sites look to be taken with wide angle lenses and filters, so keep that in mind. It may seem a bit smaller when you walk in and maybe not as 'polished and shinny'. But this did not detract from the comfort and coziness of the place. We both felt it was an excellent choice and you can not beat the location smack in the center of Paris. I will be coming back to stay here again.