Overall, I recommend it and I'd stay there again.
The good:
The location is absolutely fantastic!
Couple of blocks from the Seine, very close to Notre Dame, Conciergerie, Saint Chapelle, Pont des Arts and more. Also it's right beside Saint Germain area which is beautiful. Lots of shops and restaurants around and groceries stores, including a Carrefour that closes quite late.
The apartment looks just like the pictures. Very clean, nice decoration, fully equipped kitchen, 1 double bed 1 single bed, a wardrobe, lots of outlets and empty shelves. There were bed sheets and towels for all 3 of us. Communication with the host was easy and quick.
The not so good:
No shower curtain, the bathroom gets all wet after every shower.
The washing machine doesn't work properly. Clothes came out stained with soap and not really clean.
The living room single bed needs fixing.
The wifi signal isn't the best, a bit weak at time, but idk if there's much to do about that.
If the host fixes those issues, the apartment is very close to perfect.
I'd definitely recommend it for a couple or 3 people.