We definitely enjoyed our stay at Nicolas' place. The terrase and the view are truly splendid! Overall the flat is small and somewhat shabby but nice, very well located; it is also a really good value for the money!
Nicolas is nice and replies quickly.
You basically have everything you need in the flat; one problem is that it was not exaclty sterile clean in the kitchen. If you can live with that, you are guaranteed to have a great time here.
The flat is really just a few minutes away from metro, the top of Montmartre is 10 minutes walk, supermarkets and nice French bakeries located nearby. A few neighbouring streets also look dirty and full of rubbish, better walk the direction of Montmartre)