While working in Strasbourg, I lived on a small river island, Île de la Niederbourg, in Illkirch-Graffenstaden. This city in the Grand Est French region has many popular attractions, including Parc Animalier Friedel, Centre Culturel de la Ville D’illkirch-Graffenstaden, making it well worth a visit.
read more about the Île de la Niederbourg (Archi-Wiki)
history of the river island (in French)
Illkirch Graffenstaden choosen best city in france (in French)
Ile de la Niederbourg