This apartment was my home for two weeks in Paris and I thoroughly enjoyed every minute of my stay. It's charming, cozy, and filled with lots of character. All the amenities were working and working well. The windows in both the main room and bedroom bring in lots of natural light during the day - which was very much appreciated. One of the best aspects of this apartment is the location. Located within a short walk of two metro stations (Jules Joffrin and Simplon - I was able to get to most places I wanted to visit in under 25 mins). It's also a 20 min walk to the very cool Montmartre area (and Sacre Coeur). Or you don't even have to walk very far to find some really good cafes and restaurants (my favourites were Thu Thu for Vietnamese and La Chingaga for Mexican) - the neighbourhood is simply fantastic. Not to mention the convenience of whatever else you may need during your stay: supermarkets, bakeries, pharmacies...literally everything and all within walking distance.
The only thing to note about this apartment is that it is located on the top (6th) floor of the building without an elevator. If you have accessibility issues, you may want to consider this. Otherwise, all in all a great stay.