We stayed at this lovely apartment late October, beginning of November 2014, for a friends 25th birthday trip! There were 3 of us and it worked perfectly. The building is beautifully French and rustic, we felt like locals living in Paris! The narrow spiral staircase feels like you have gone back in time. There is no lift so be aware that there are lots of steps to climb.
It is not far from the Moulin Rouge (a short Taxi ride) and a charming 15 minute walk from Montmarte which is a must! We went on a Sunday morning, the weather was fresh and the little town is so enchanting. The metro is easy to navigate and again only about a 10-15 minute walk.
My main tip would be to use the taxi app Uber, it is very safe and very cheap and picks you up directly from your door. You cannot hail cabs in Paris so trying to local a taxi rank would have been quite dangerous for 3 young women at night. The supermarket and bakery are all on the same street which was very handy indeed.