We had a great stay in Carolynes apartment! Nice Parisian building in a calm side street, nicely done up. It is located near Montmartre and you can walk to the next Metro/Bus station in a few minutes. A range of restaurants, supermarkets, bakerys... are very close.
Check in time was flexible and we could check out at 6 pm, which was very generous!
The only negative thing was the cleanliness (floor, dishes).
Overall, a great experience!