This apartment was an absolutely fantastic place to stay while in Paris. We stayed for 5 weeks and found that it had everything we needed for an amazing and incredibly memorable trip. The location is incredible; within walking distance to bars, restaurants, grocery stores, tourist sights (Centre Pompidou, le Marais, Les Halles, Picasso Museum, Notre Dame are all within 5-20 minute walk) and metro stations (Arts et Métiers, Étienne Marcel, Rambuteau, Les Halles). Also, while the apartment is in the heart of much excitement, we felt very safe and it was quiet inside.
The hosts were very responsive to our questions and incredibly accommodating when we reached out.
While the lack of air conditioning was not an issue on cooler days during the majority of our trip (we were there mid-April through end of May), it became quite warm during hotter days, and we made very good use of the portable fan.
Only thing that we would have changed was that the bed was not very comfortable, and the pillows were also not great which became challenging when trying to get good nights' sleep for adventurous days.
Overall, however, I would highly recommend this apartment for an experience in Paris you will never forget.