The apartment is nice, it has everything you need and it is pretty inside.
kitchen is fine, bed is OK and the bathroom is OK too. The spaces are fine compared to other flats in Paris.
The real problem is the noise of the street! There are people screaming until 2AM and then the garbage collection start at 6AM in the morning so I had a really hard time sleeping there.
You have to consider also the position up in the hill of Montmartre: it is cool to live in a very touristic place, you can walk without anyone around in the early morning but it is very poorly connected, there are no supermarkets up in the hill and every time you go home you have an hard time getting uphill.