I am going to break this down into 2 parts since I think it is warranted in this case.
First, the location and the apartment. We LOVED the location of the charming island of Ile Saint-Louis. This was our first visit to Paris and after staying on the Island spending 3-4 days around various parts of the city, we felt we had made a great choice (at least for us) on location. The apartment was close enough to walk to many things and/or hop on mass transit and at night it the apartment complex was very quiet. The apartment was very nice and had many amenities. The apartment was clean, the water pressure in the shower was strong and the bed was firm. All very good. Consistent with some prior reviews comments, I would give consideration to another apartment unit if you have major problems with steps. You do not need to be an Olympian to get up the 3 flights of winding stairs, but your quads will know it.
Part 2.... this is where there is a bit more of a rub. I was expecting a bit more from a Superhost experience. We were NOT expecting a tour guide and/or special concierge services (we had done our homework), but the term Superhost did set some expectations, rightly or wrongly, and we thought going to a Superhost location would be good for our first visit to Paris. We had one or two clarifying questions during the reservation process and a question about check-in. In all fairness to Leo, these questions were matter-of-factly addressed within 24-48 hours, or so. However, nothing was done proactively. We never got a welcoming email with any expression of offering assistance during the stay if needed (or thank you note for our stay for that matter). There was no welcoming binder in the apartment with local tips and/or information or instructions on working any of the major and minor appliances. For example, I wasn't expecting to have to Google for European range-top operating manuals and translating them to English to make sure the range top was completely off before leaving the apartment for the day. I'll spare other examples with other appliances. We eventually figured everything out and had some fun telling each other that our Super Ghost would be contacting us to help us out.
In summary, in my opinion, the apartment unit and location are very good. I think with just a little bit of additional effort the experience staying there can be even better, particularly for first-time visitors to Paris and those traveling from outside Europe. Also, I have concluded that I do not need to set AirBNB filters on just Superhost sites for future travel plans. It appears that some of the major drivers for Superhost designation are volume of stays and timeliness of response to inquiries through the AirBNB website.