This is a lovely flat right in the heart of Paris. Notre Dame, the Latin Quarter, the Marais, and Saint Germain are all within a short walk, and there are a few metro lines close by as well.
The communication throughout the process was always prompt and helpful. Check in and check out were easy.
The flat was cosy but had plenty of room for 3 of us. Be aware that only one of the two bathrooms is en suite. The other is located directly off the living room area outside the bedroom, so let's just say you need to be comfortable with being near your flatmates' bathroom habits.
The flat was stocked with the essentials: linens, towels, soap, shampoo (L'Occitane, so quite nice), some coffee, dishes, cookware, glassware. A nice touch was the fresh flowers and bottle of wine upon arrival.
All in all, absolutely no hesitation to recommend this flat. The location was unbelievable. Everywhere we went, when people asked where we were staying and we said on the Ile Saint Louis, you could tell how impressed they were.