We had an amazing stay at Melissa's place. The apartment matched the description perfectly and was well taken cared of (there is an elevator). Her team was very prompt to answer any of our question, which was very much appreciated. Prime location, very close to every type of shop you could basically need and about 15 minute walk to plaza Serrano where you can experience Buenos Aires nightlife. My only "negative" (emphasis on quotation marks) is that there were not a lot of bath towels, but I guess the laundromat that's 30 seconds walk away makes up for it (they take your clothes, wash-dry-fold in half a day for a very good price).
ProTip if you visit during heat wave: the smaller room tends to get a bit warmer. If you close the kitchen and bathroom doors, the air conditioning will cool the smaller room more effectively.
I would definitely book again!