Pros: The flat is 2 mins from chateau rouge metro station. The housekeeper who only spoke French met us and we don’t know any French at all. We managed mostly by pointing and gesticulating, she did try calling the host but she was in a meeting and unavailable at that moment. The host is very quick to answer all queries and we didn’t feel the need to contact her at all for anything. There is a fob to get in the main door, the smallest lift in the whole world but quite efficient, up to the 3rd floor and another key to get in the door. You enter a spacious, well-lit airy flat, well furnished, with an eclectic mixture of furniture and art pieces. The kitchen is well stocked, she had very kindly left some coffee pods out for us to use. There is a microwave, oven, washing machine, fridge, toaster, coffee maker etc.
The house is southwest facing, so ideal for the summer, cool breeze wafts in from the windows in the large sitting room. The street can be slightly noisy during the day but the bedrooms face an inner courtyard and you could hear a pin drop in there. Beds are very comfortable and the curtains are thick enough to block most of the light out.
The street itself has a boulangerie, a supermarket, and a lovely café called café Custine.
We loved the place, it was fantastic and we thoroughly enjoyed staying there.

Cons: the train station chateau rouge and the immediate surrounds are quite rough, untidy and a bit scary at night, (a few people drunk and smoking hash etc.) then again – not sure if this is common in Paris. But we had no incidents – so please do your own research. As you walk away from the station things calm down.
There were no empty cupboards or drawers to put our clothes in – we were fine because it was only 3 nights, if you plan to stay for longer and don’t want to live out of a suitcase you might want to consider this.