We stayed at Cathy's flat for 5 nights during July 2018 (two adults + one 5 yo child).
The location is very close to the subway station on line 2. The flat itself is a small duplex with the main bed upstairs. The flat was clean and consistent with the online description.
We found anything we needed in the flat during our stay.
We did not see Cathy in person during our stay but she answered our questions quickly and we had no issue to check-in.
We recommend this flat for your future trip to Paris!