This unit advertises that there is air conditioning, but they don't mean central air conditioning. Instead, there is one portable unit where the hot air output doesn't fit well in the window. During a summer day at 23C in Paris, the loft was measuring 33C at 2PM. This is with every window open (there are 3) and the air conditioning unit operating 24/7. The air conditioning unit is insufficient to keep this amount of space cooler than the outdoor temperature.
There are no shades on the bedroom windows. This means that at 9pm, when it's very light out during the summer months, it's impossible to sleep without an eye mask. The sun comes up around 8am, and the windows are east facing, so they prevent sleeping in as well.
Generally the decor was quite nice. The kitchen was stocked, and most items there appeared to be working when we tested them. The sofa bed on the first floor is a nice place to lounge on.
The primary upstairs en suite bathroom had no toilet - just a shower and sink. So, while the listing says there is one bathroom, it is in two pieces, on two floors. So there is a sink, a shower and a towel rack upstairs attached to the bedroom but if you need to use the toilet, you’ll have to go down a set of stairs to the main floor.
There was no shampoo, no wash cloths, and the towels did not match. Towels were really scratchy and smelled like cigarette smoke.
In the upstairs bathroom, there was no mirror to get ready. You have to go downstairs to the room with the toilet to access the only mirror in the entire apartment. In this water closet, the toilet seat was not secured to the toilet, and was quite loose.

The loft/bedroom windows face a roof surface. Maintenance workers walked in front of the loft/bedroom windows at 8:30am one day. At least we had a warning because we heard the workers stepping on the roof. The bed faces these windows, so privacy isn’t guaranteed.
Conclusion: Nice decor, but we vacated the unit 2 days early because of the high temperatures indoors. We couldn't relax in the apartment during the day (10am - 4pm) in the summer months.