We had a lovely stay in Oliver's apartment in Montmartre. The studio is as described and very comfortable (especially the bed) and had everything we needed. The apartment is an easy walk from the Gare du Nord station. Aline met us and made check in easy. Communication with both Oliver and Aline was good.
It's in a great area, feels safe and we enjoyed seeing the artists at work and enjoyed the musicians we encountered which makes for a lovely atmosphere, particularly in the evening when there were less tourists (like us) around. :-)