The good: very quiet flat in a lively neighbourhood; very reactive and helpfull host.
The bad: impersonal-ikea-style decor; smaller than expected (I would not recommand it for 4); kitchen is not really suitable for doing more than breakfast (no range hood, few tools, no basics such as oil or pepper); crockery is very sparse (3knifes, 1 spoon, 1 coffee mug for 4 is namely too short).
During our stay, we had a some issues: stop the freezing aircon, repair the sofacouch, repair tv. The host always responded quickly, nicely and efficiently. He even bought a new sofa bed. However dealing with those points, one day after the other, also tarnished our stay. It would have been much better not to care about such things and just enjoy the city. In comparison, not my best airbnb experience in Paris. But there is room for improvement. Location is especially great.