My boyfriend and I stayed at Matthias's place last week when we had 5 days in Paris at the end of a longer French vacance. From our first conversation right up to leaving our keys, the whole stay was wonderful!
Matthias is a true artist and you can see that from his apartment, it was so Montmartre dreaming to stay there around all of his French books, photographs and sculpture that a holiday let doesn't have. There are 6 flights of stairs to walk up & no lift, but that is nothing compared to the steps to the Sacre Coeur, which is just a short walk away from the apartment, and an unmissable feature of the wonderful Bohemian heart of Paris.
The metro stations around the apartment are very close and get you to the center of the city very quickly. The area was of course not the same experience as one would get in a four or five star hotel - but if you want to live like a real Parisien(ne), I could not recommend this apartment enough.