This is a great little flat, in a wonderful part of the city, which feels more like an authentic French area and a lot less touristy. There are great bars and restaurants nearby, and the Sunday farmers market (10 minute walk away) was super. The metro is a 2 minute walk away, but we managed to walk from the apartment to the city centre, which was really lovely and took about 30-45 mins depending on where you were going.
The flat itself was perfectly clean and the pictures are very accurate. It is a small space and the stairs are a bit steep, but you get used to it, and the space has been used incredibly efficiently. As there is so much to do and see in Paris, it is the perfect base from which to explore, as you're often out and about. It was also only 18mins on the metro from the gare du nord station which is handy! Would definitely recommend, but would advise that due to the space, it's best only for 3 nights max.