Kat's apartment - and Kat herself - are fantastic in every way. The apartment is charming, beautifully decorated, equipped with wonderful books on French art and culture, and filled with Kat's own artwork. The location couldn't be better - on a very quiet street, with half a dozen superb local grocery stores, butchers, bakers, etc. within two blocks. The brand-new kitchen is fully stocked with everything you need.
It's a five-minute walk to Sacré Coeur, and even better the apartment is halfway up the hill so there aren't that many steps to climb. A couple of minutes in the other direction is the Rue de Clignancourt, a really nice opportunity to get a glimpse of the diversity of Paris, which most visitors don't see. Just one small note for visitors in summer 2017 - the nearest Metro station (Château Rouge) was closed for repairs in June and will probably be closed through July. But Marcadet Poissoniers and Barbès-Rochechouart are both less than ten minutes away. (Marcadet Poissoniers is two stops up the subway line but a slightly shorter walk, and the number 4 line is a straight shot to the city center.)
It was the perfect vantage point for exploring the birthplace of modern art in Montmartre. Above all, don't miss the Musée de Montmartre, a fascinating collection of paintings, photographs, and historical memorabilia in the house of the painter Suzanne Valadon, with Renoir's beautiful gardens. (As an accompaniment, check out Sue Roe's wonderful book, In Montmartre: Picasso, Matisse, and the Birth of Modernist Art.)
Kat herself could not have been nicer or more helpful - instant communications from the moment we booked, and great follow-up after we left. She's also a very interesting person and a gifted artist. Wish we could have stayed longer - and hope we'll be able to come back in the future.