Great place ! Fabiana was friendly and quick to respond to any questions and even sent me information about a few interesting events in Buenos Aires (BA) while I was here. She was flexible with the checkout time (with some advance notice).
The apartment is only 5 blocks from Las Heras subte (metro/subway) station and walking distance from many of the key sites of BA. Fabiana had someone waiting to let me into the apartment on time when I arrived.
The place was clean and tidy and well maintained (looks like it was repainted not too long ago). Everything I used in the kitchen worked well (fridge, toaster over, microwave, heating element). The apartment is well stocked with dish soap, paper towel, hand soap, toilet paper, towels, etc.
You can hear some sounds from other apartment doors and sounds of the city below. If you need complete silence (likely impossible to find in such a great centrally located place) then it may bother you but it is fairly muted since the apartment is on the 7th floor. I didn't find it disturbing and slept well.
Overall this is a great place and very good value. I'd highly recommend it to any person or couple looking to stay in BA.