(1) Cleanliness is a problem. When we arrived, there was a layer of dust that was on absolutely everything. If it had been cleaned, it had been long prior to when we arrived. There was mold in the grout of the bathrooms and and the ceiling in one of the bathrooms had dust and stray hairs attached. The dishes in the kitchen need to be replaced, and some of the glasses even had mouth marks on them. The sheets on the beds had holes and were also in need of replacement as there were various stains on them. Both the towels and sheets were of poor quality.
(2) This apartment is listed by a rental agency in Paris, not an individual host. They will insist that you buy renter's insurance before arriving. The insurance can be anywhere from 100-200 euros.
(3) The ceilings of this apartment are no higher than 7 feet. If you are tall, you should not stay here. That being said, this apartment is quite large by European standards (both bedrooms are large, as is the common area).
(4) This apartment is not in the Marais. It is in a great location, but it is in the 11th, not the 3rd. That said, it is a 3-5 minute walk into the North Marais, and about a 15 minute walk into the center of the Marais.
(5) The wifi in the apartment is delivered through an extender, not a router. I believe this is because the agency has another apartment elsewhere in the building, and just extends the wifi from that apartment into this one. While the wifi works fine in the common areas, it often does not extend well into the bedrooms. If you experience issues with the wifi, it is very difficult to fix given the router is not in the apartment.