I stayed at Juan Manuel's place with a friend for one month. It is situated in a great location relative to restaurants, laundromats, and a gym. It is a quite a long walk away from Plaza Serrano (20 min) but I felt very safe walking at all hours of the day and night.
The place itself was pretty close to what was advertised. Moderately spacious, fully stocked kitchen, one full bathroom, and the bedrooms we're a great size and comfortable. The downsides of the place itself was that the laundry machine was broken when we tried using it but it is actually more convenient to go to laundromats so it is not that big of a deal. Also the wifi is painfully slow. My friend and I we're both working remotely and we had trouble with video calls even when sitting right beside the router. Don't expect to be able to do anything on the internet from the bedrooms because it does not reach that far. This should not be too difficult an issue for the host to solve though.
As I met more people in Buenos Aires and heard about their living situations I realized that I seriously overpaid for this place relative to what you can find in the city using other real estate sites. It comes with the territory of going to a new place and not knowing what a fair price is. But if you are paying more than 1000 USD for a place to yourself in BA you are seriously getting ripped off. Airbnb charges high fees so that is part of the issue but once you get here you will get a better idea of how things operate.