Unless you’re an entomologist, I would pick a different “cozy” flat in Paris. I second Amit’s review of December 2021. Aside from constant cockroach infestation, I would add: dirty floor, dirty pots, dirty doors, broken heater, curtains that don't close and therefore let street light in the bedroom at night, and finally smoke smell in one bedroom and living room.
Upon my arrival up until my departure (7 nights), I reached out twice daily to the “host” (which I suspect is not an individual, but likely an England-based company) both via phone and via the airbnb website portal. The situation never improved and somehow got worse. Airbnb ended up refunding me 50%, flagged the host, and told me that any repeat incident may lead to this listing's deactivation.
Do yourself a favor and look somewhere else.