Great place and I would stay here again in a heartbeat. It's in a gorgeous old building but completely redone inside respecting the old features. I felt like I was living in Buenos Aires.
There is no airco but 2 strong fans. We were there when it was 35 degrees Celsius and it was more than comfortable.
I would fully recommend this place. Great wifi, close to San Telmo. Direct bus to Palermo. Uber is very inexpensive as well so it's easy to get everywhere.