We stayed 5 nights at Oscar's place, which was just amazing. The location is perfect: in the middle of Montmartre just under Sacré-Coeur (you can actually see it from the window!!). Then, the other window has a beautiful view of all Paris, tower included! Walking all day around the city and then enjoying the skyline at night was a dream I will never forget. On the practical side, the apartment is small but well maintained. Moreover, we appreciated that the bathroom and shower were good, despite the little space available. Going back to the apartment requires some effort (a lot of stairs), but it's a very little downside for such a view :)