Pros: Ana is a wonderful host and very kind. The apartment is well located in the 15th arrondissement which is nice because it's a break from the super touristy areas and it was well located for my research trip to UNESCO. There is an elevator which is also great and rare for Paris!
Cons: I stayed for 7 weeks and I think the apartment is better for a shorter trip. The cleanliness quickly declined and some days the smell or the cat litter in the bathroom was so bad that I could not brush my teeth in there. The kitchen is super super tiny and shared with the Host. Although she was a wonderful host, she often left dishes out and rotting food out for days. Since I stayed for so many weeks this became a problem because I could not cook. We shared a mini fridge which again was pretty difficult in this longer term situation.
Over all I would recommend this place still, just maybe for shorter trips!