I spent a month here and had a great experience. The hosts were quick to respond and were very communicative. The apartment looks exactly like the posting - the natural light is great, the giant glass doors that run the length of the wall are fantastic. At one point the entire building lost power (as did much of the street block) and the hosts advocated with the utility company and kept me informed. When I ended up needing to stay elsewhere for couple of days, they quickly refunded my days away.
The location is PERFECT. I could not have asked for a better spot to stay in. The building manager, Martín, is lovely. I told him that I only spoke a little Spanish and he understood that but kept speaking to me in only Spanish and somehow we understood one another. He was always greeting me and offering help.
The apartment has everything you need, especially in the kitchen.
Only a couple small things could be improved on. The towels feel very old and could be updated. And the washing machine smells a bit and the dryer function doesn't work, which makes the air dried towels even more coarse. This should not dissuade you, I'd gladly stay there again and didn't find either issue big enough of a problem to bring up to the hosts. Had I done so I know they would have addressed it immediately.
Finally, there is a musician in the building that plays drums usually between 6-9pm. I was usually on my way out or in when it started but if you work weird hours remotely be aware of it.
This is a lovely apartment in the middle of it all. Stay here!