Jane's place is lovely, very stylish, full of character and lovingly decorated, just as shown in the pictures. The bedroom is very quiet (apart from when the neighbours decided to have a party - but that's a risk you have to accept in flats) and the bed was very comfortable - I slept really well. We wouldn't recommend the living room for light sleepers though: it was right on the (side) street and as such pretty noisy.
As for the location, the metro station is conveniently right across the road - yet we were pleasantly surprised that we couldn't hear any noise from the trains. It is a lively and interesting area, Montmartre is a short walk away. However, I wish I had noticed in the house rules that the place is not 'safe or suitable for children' (despite being listed as kid-friendly), as I didn't feel entirely at ease bringing our 7-year-old there: there were men outside at pretty much all times of the day selling contraband and we felt a little intimidated on arrival (I used to live near London's King's Cross, so am no stranger to this sort of activity). However, in a weird way, they made us feel quite safe by being there - as if standing guard - and they never approached us, never attempted to get into the house or bothered anyone. All in all, we'd be happy to stay here again.