The apartment is perfect for a short- to medium-term stay. I was in Buenos Aires visiting my family a few blocks away for 1 week, but I would return for 2, 3 or even 4 weeks.
The apartment has everything you need for a short stay, and I could work remotely from the desk / table comfortably. The Wifi cuts out at times, but that's normal for Buenos Aires and Argentina as a warning to foreign travelers. The Wifi and mobile data networks are no maintained and in fact the apartment had better Wifi than most cafes nearby. Having said that, the surrounding area (Cañitas) is amazing! Tons of cute cafes, restaurants, and boutiques, as well as essentials like pharmacies and supermarkets. The check in and check out was smooth and efficient and the communication with Javi worked well. The apartments looks even better than in the pictures, and it's a quiet building in general which is rare. I slept well and I could also work well.