This was a great place to stay. The pictures Celine posted are an accurate portrayal. Easy access to the metro, quiet neighborhood. The flat is spacious and there is a grocery store just down the street with a nice park across from the grocery store. The flat is maybe a 20 or 25 minute walk from the Moulin Rouge and a little less to the Sacre Coeur and Espace Dali. The flat has great amenities like a dishwasher, microwave, and washing machine.
There are some small negatives:
A) No elevator and the flat is on the 4th floor. So, if you're handicapped or have a lot of heavy bags, that will make things hard. I personally didn't mind the stairs but it's something to be aware of.
B) Internet is very slow.
C) Stair well isn't lighted at night. So, if you come back late, you'll have to climb 80 or so steps in pitch darkness.