The apartment is okay. Everything worked just fine, but because I was travelling in a group of four, I felt the place was a bit small. But if you're travelling alone or as a couple, I think it's just the right size.
The Pros:
Location: the apartment is 4km away from the Louvre and about 10km from the Eifell Tower. There's also a very vibrant canal just accross the street. Also, there's a subway station 100m from the apartment.
Shower: the shower was amazing. Great water pressure and temperature.
Portable AC: there's a handy Portable AC in the living room.
The Cons:
Pillows: there weren't enough pillows for the four of us.
Microwave: the microwave is not in very good condition, and I felt it was going to stop working suddenly when I was using it.
Noisy neighbours: apartment upstairs decided to throw a really loud party until 3am on a Monday. I was surprised no one complained