The apartment itself is great - it was pretty much as we expected from the listing. The balcony on the living room level is much nicer than it seems from the pictures, it usually wasn't worth going up to the roof, especially at breakfast, when we wanted to eat outside. The location was also great, there are a ton of bus stop nearby, not to mention supermercados, restaurants, etc. The proximity to Recoleta was also great - we only went in once because they've started charging tourists, and you can't pay the fee with pesos, only via a credit card, but the plaza outside is nice for walking, people watch, etc. and there are a lot of restaurants right there.
The area was also relatively quiet for a city, the one exception being the jackhammers being used to demolish a building right next to us, and at the same level. At least they started late, ended early, and took a long lunch. It was pretty annoying though, at least if you're in the apartment instead of touring the city. Aside from that, it was actually quieter than we expected for a big city, and it helped the apartment was high up.
The apartment was very well equipped, down to even having a umbrella and a grocery cart for grocery shopping. We didn't have to buy much to be comfortable there. The one thing I really wanted to replace was the ice cube trays... they didn't stack! But I kept forgetting when we went to a store. We didn't actually need to stack the, we didn't have much in the freezer, but it was strange not being able to stack them.
One thing to note is the pool on top of the building was not being kept up, but I assume that was because it was winter. It was never warm enough I wanted to get in it even if it had been clean.
Pablo and Krist were very helpful and responded quickly, but we didn't have any issues aside from a problem with the water heater, and they had a repair person over for that as soon as we told them about it. They were excellent hosts.