The location is obviously amazing. The apartment is very large for Paris, but even if you're there for a month like I was you're not going to be spending much time there, as there is so much on the doorstep.
Bedroom was a major plus, it was huge which I really liked.
There are loads of lovely little touches in the apartment like a piano that's been converted to a bar, and an old writing desk, and lots of Japanese design-y pieces.
The Internet is strong and stable.
You'd hear the odd bit of noise on a fri/sat night from people walking home but there's nowhere near that makes noise constantly.
All in all the place is great, and great for long stays, I'd definitely stay there again.