This was a home that stole my heart. Having stayed both closer in-town and here at Gaelle's on my recent visit to Paris, I can say that while I found both locations good for different reasons, I *loved* this apartment. Loved it. It is warm, comfy, the neighborhood is extremely safe, and the fact that you are up high, and look out over the city from the back of the apartment is, in and of itself, pretty amazing. Gaelle's friend will meet you and go over everything you need to know about the apartment, and is always a phone call or text away. There is also a large notebook provided with all kinds of tips regarding where to go, things to do, and where to eat, etc.
If you want to stay in a place that is a bit off the beaten path when you visit Paris, I would highly recommend Montmartre. However, a warning. If you are not in good shape and have trouble navigating hills, you'd probably be better off somewhere else. But if you do stay in Montmartre, I would highly recommend Gaelle's apartment. Spotlessly clean, warm, inviting, and in a great location, It was a lovely, lovely place to call home. If only for five days.