The apartment was exactly how described but I would add: "This is a bit of paradise in the heart of Montmartre."
Apart from being in this fantastic location, the size is perfect, incredibly comfortable and Oh so charming...
Xavier, was a great host. He was away but felt very close, making sure I had all my questions replied very quickly and that things worked out fine.
I recommend you add an extra day in Paris just to stay in if you book his place! ;)