The apartment was brilliant - well designed, great shower, very quiet, spacious, good bed, nice bedding, kitchenette is perfect - everything was just really well designed and fit for purpose, close to three metro stations and the number 30 bus which took us to the Eiffel Tower - we would definitely stay there again.
The only downside is the surrounding area - you are a short walk from Montmartre and the Sacre Coeur, you are two minutes from the Moulin Rouge, there are great restaurants and patisseries etc around but you are literally surrounded by sex shops and lap dancing/peep show bars. I think if you are traveling with kids of primary age I wouldn't want to stay there - or even if you are a bit prudish - you are surrounded by windows with every sex toy on display including an Eiffel Tower dildo. We found it funny - you might not.