This was my second stay with Katherine (the first one was in the other studio), and it was equally perfect as the first one. Katherine is a fantastic host, quick to respond to any messages, and always trying to accommodate you to the maximum that she can.
The studio itself is very comfortable and ample (for New York standards at least). The balcony is an additional touch that you will not find in many AirBnbs at this price range, in the same way as the washer and dryer are. Everything was immaculate and professionally cleaned upon arrival. Finally, the location is excellent. Personally I find South Slope to be one of the nicest neighborhoods in New York (I have lived in New York for more than a decade).
I would definitely stay again at this one or at any of the other apartments Katherine has on AirBnb. In fact, I will stay again in this same studio next month.