We stayed here for a full month and loved it! You can't beat this location. Ile-St-Louis is beautiful and you can't get more central than this. The apartment is steps away from the Seine, restaurants, bars and shops. The area is very safe and peaceful. There are multiple metro and bus stops close by as well. It's an honor to stay on this island!
The apartment building is cute and very quiet. You enter into an interior courtyard to access it. The apartment itself was as described and the windows face into the courtyard. It could have been a bit cleaner but overall a great stay. Other reviews mentioned bath towels but no hand towels, which was true for us too. The bed was comfortable, the pillows could be improved a bit but we were in Paris so we got through it ;) The stairs were a little rough with luggage the first day, but otherwise they are manageable. The living room is set up well. We brought our own Roku/streaming stick from home to hook up to the TV and it worked well. The internet speed is fantastic.
I'd definitely stay here again and would recommend to friends and family. Perfect for a short or long term stay.