My husband and I stayed 7 nights and found the apartment to be very comfortable. The bedrooms are on the courtyard and quiet for sleeping. The main bedroom has an ensuite with a good size shower (for a welcome change!). The bed was bigger than a US queen but not quite a US king. It was a bit too hard for one of us but we both slept well. The small bedroom is really small; would be ok for kids or a single small adult. Its attached bathroom had a small shower and toilet. The kitchen was efficient for light cooking. Comfortable living room with a view onto the building's gorgeous twin across a private square. The elevator was tiny but we were grateful for not having to climb to the 5th (US) floor.
It was one of our better apartments in Paris over 6 trips. It's a bit far from the main attractions except the Eiffel Tower. It's close to the Passy metro station so still convenient to the rest of Paris. The neighborhood is just gorgeous with lots of shops, restaurants, etc.
The host and her daughter were very helpful and nice. We'd stay at this apartment again and recommend it to others unhesitatingly.