First off, this property was not build as a living space - it was a commercial space (shop/office) and converted into an apartment with mixed success. While the apartment does have spaces dedicated as bedrooms, they are merely compartments separated from the main space by glass and/or thin panels - definitely not what you would expect from a purpose-built apartment. Additionally, the door to the bathroom downstairs was a sliding frosted-glass door so you can expect little privacy if you are travelling with others. The space was big enough to comfortably fit a family of 4 (and although you could probably cram more people, I would not recommend it).
The apartment is located on the ground floor and the former shop windows (albeit frosted) can only do so much about insulating from the traffic outside and providing privacy. The property was generally clean and of good quality but I would definitely not describe it as “luxury”. Some general wear-and-tear items (e.g the showerhead in one of the bathrooms was not working) but nothing major. However, there is limited ventilation and that could be an issue especially if you are travelling in the summer months. There is only one window that could be open and it overlooked an internal courtyard (hence could be noisy; privacy issues) plus was right on top of an AC unit from another property. Unfortunately, the open window and the provided fans did very little to dissipate the heat (it was upwards of 35 degrees Celsius in Paris during our visit).
The host was very responsive and happy to provide suggestions for the area nearby. The area around the apartment is OK but not the best (especially for the price paid). The Louvre is not too far (~20 min walk) but nothing in the immediate vicinity (it is a residential area with all shops in the ground floor and some areas have a bit of “red light” feel to them). Getting by car to the apartment could be tricky because of the maze of one-way streets around it plus they were closed for cars on Sunday.
Overall, I found the apartment a bit expensive for the type of accommodation and its quality. One could consider a more central location (1sr arr.) or something a bit more vibrant like 3 arr. or 4 arr. (e.g. Le Marais).