We had a great time in this apartment. Everything was as described and as shown in the photos.
1. The location is amazing, between the Opera and the Louvre. Many of the Paris attractions are within 10-15mins walk. The area is very safe and quiet, and the apartment is very safe (you have to open 3 locked doors in total before reaching the apartment). The metro is just around the corner (station Pyramides). You can also find bikes and e-bikes for rent just outside the building. Otherwise you can use Uber which is usually around 8-10euros for most rides in the center. There is a supermarket (monoprix) just 50m away.
2. The apartment has a cosy sitting area and 3 bedrooms (2 with doube beds and 1 with a bunk bed, all with very comfortable mattresses and pillows). In each room there are wardrobes to comfortably hang clothes. Also the sofa can become a double bed if needed. There are in total 3 tv sets with access to netflix and other media platforms. The wifi is fast and reliable. One needs to note, as is specified in the listing as well, that the apartment is low-roofed (as is common for the 1st floor of old buildings in Paris), meaning that people >180m will have to mind the top of the doors as they might hit their head. Also the walking spaces around the double beds are tiny (it is easier to crawl into your bed position than walk by the side) but this really adds to the cosiness of the place. Also the kitchen is beautiful, with a dedicated large table for having dinner (and that conveniently connects the kitchen with the living room). The only problem we had was that there was no large pot to cook, e.g. even for a quick pasta dish (we are a family of 4). Gladly, after some back and forth messages, the company reacted efficiently and bought a large pot for us to use.
3. Check in was very hassle free, as there was a very polite employee waiting to welcome us and show us the apartment (thank you Fabio!). We even made a whats app group with him for further communication during our stay.
All in all, a very positive experience.