The apartment is as shown online — and definitely a good value for the price. It is not close to the Marais (about a 20 min metro ride), but the neighborhood is totally fine. The flat is on the ground floor so it is loud in the morning.
Regarding cleanliness: the comforter had brown liquid all over it and was unusable. The hallway of the building is quite rundown (paint is peeling) and smells strongly of trash.
Regarding communication: I sent numerous messages to the host (via the Airbnb app) about the check in procedure, but received no response. I called and emailed the additional numbers provided in the confirmation but still no response. When it was less than 18 hours prior to arrival, I called Airbnb who reached out on my behalf for check in support. Only then did the hosts respond. They were indeed nice when they responded but it seemed unnecessary to involve Airbnb to receive a simple response.