Fantastic apartment for a short stay in Paris. It's actually more modern and airy than the photos indicate.
A few highlights for me were:
1) Great location right at the hills of Montmartre - close to metro stations with access to many of the best bakeries or bars in Paris. It's a romantic (albeit a bit touristy) area - you will enjoy walks around the neighborhood and walking up the hill.
2) Super modern apartment - unlike many buildings in central Paris, it's a new build with a modern, spacious elevator and smart door access. You won't have to worry about spiral staircases or ancient keys. Apartment itself is newly renovated, well-designed, sparkly clean, with strong air-conditioning for the summer heat. I also enjoyed the large windows, views of greenery, and lots of sunlight brightening the apartment.
3) Good communication with the host - very quick response and helpful with other things, like printing and laundry, in the area.
Not a lot of downsides, but just a few things to note: 1) there isn't a washer/dryer so you'll have to bring your clothing to a laundromat, which seems to be common in Paris; 2) the pillows are a bit hard/sturdy if you prefer soft flat pillows.