Spectacularly situated on the Seine with a view the left bank, Notre Dame and the Eiffel Tower and Pantheon. Very spacious with a fully equipped kitchen and 3 different kinds of bathrooms. All is clean and well stocked with electrical strips, entertainment center, etc. You have 2 floors in your unit and it is on the view side of the building for river traffic and glamorous vistas that Paris is known for.
A nice concierge will help you get in and leave your bags if necessary in the entry. Lots of light and comfort when you come back each day. Ile Saint Louis is more like a village with restaurants, market, pharmacy, cafes and far nicer than the larger extremely busy island next to it: Ile de la Cite, which has giant government buildings (including the Court House) and armed police presence. I don't recommend staying there.
Ile San Luis is easily the nicest neighborhood in all of central Paris. Very safe and quiet. A real oasis in a busy city. That's why many of the celebrities have lived there. Close to the metro too. Host Veronique is very accommodating.