Firstly, the location is fantastic, just a 15 minute walk from Sacré Coeur and really easy access to various metro stations and bus routes. As for the apartment, we couldn't believe our luck when we walked in - it's on the fifth floor with a balcony, so evening drinks watching the sun set over the rooftops was incredible. The decoration is eclectic Parisian whilst also managing to be comfortable and well-equipped.
Eugénie was easily contactable and friendly.
The only slight issue is that the listing states that it has private parking but Eugénie explained in advance that this is not the case - there is payable on-street parking opposite, which is great for unloading and then I found Zenpark at Citadines-Montmartre to be easy to book (online and use their app to access the car park), not too far away (5 min walk) and reasonably priced.
We absolutely loved staying in this apartment and will definitely return in the future!