Kat's place is absolutely gorgeous, very clean, spacious and while in the middle of lively Montmartre, surprisingly quiet. The decor of the flat is beautiful and the kitchen has everything you need to feel right at home.
This has been my third visit to Paris and this area is definitely my favorite. Sacre Coeur is only a 5 min walk and if you are good on your feet and enjoy walking, you can even take a stroll to the Eiffel Tower. I highly recommend Kat's place and will definitely come back next time I'm in Paris.