We had the best stay in Paris partly because of the airbnb apartment. It was beautiful - quiet (no neighbour noise), exceptionally clean, very tasteful, spacious, great showers, comfy beds. There is a lift or you can use the gorgeous old wooden stairs (also very clean).
The only minor thing for us is that we would have liked a few big mugs for British cups of tea (!) and perhaps some coffee pods that fit the coffee machine otherwise you need to buy a whole packet for just a couple of days.
Loved every minute of being in the apartment.
We had a couple of issues with one of the lights and the boiler but they were very quick at fixing everything for us and were extremely helpful. Would definitely come back!!