The positive things: Céline is nice and welcoming and the flat is located in a nice area close to the parc Buttes-chaumont. That’s about it, though. The flat is pretty dirty, especially the bathroom. There is fungus on the ceiling and no mirror above the sink. There was no soap, so I had to put my own there. The room itself was ok but not great - very basic. The mattress is on the floor like you can see in the pictures and was pretty firm. The floor was not cleaned before I came, it was dusty/dirty and had hair from the cat flying around. The cat is really cute though and super fluffy. You are not allowed to use the kitchen but trust me you don’t want that anyway because the kitchen is dirty as well and chaotic. It was hard to find a clean glass. There is a kettle and some tea in the room but no cup which makes it a bit pointless because then you have to go to the kitchen and find one. There are no curtains in the room which was ok for me but might be annoying for others. Neighbours on the other side of the courtyard can see you. Since the walls are thin you can hear the conversations and noises from Céline and her daughter which is of course not their fault but it makes the whole experience not better.
All in all I must say that I would definitely not recommend to stay there. I was happy to leave after two nights.