Location in Recoleta is superb, a lot of spots can be walked to. Cemetery, museums, Teatro Colón, cocktail bars.
The building itself is a restored mansion, which is very beautiful from the outside but also brand new on the inside. Apartment is new and super comfortable with a premium feel and amenities.
We felt at home with the hosts, very friendly and amiable people, who helped solve any type of problems from AC plug adapters to even fronting a little bit of cash to get us started, which was appreciated as it was our first time in Argentina.
Internet was very fast and stable throughout, but there were a couple of days when it fully went out on the whole block, so make sure you get a backup SIM with internet while in Argentina if you are dependent on connectivity.
One thing to note is that buses are omnipresent in BA and they are noisy. Not that much a problem at night but have to keep windows shut to isolate during the day.
Overall, we really enjoyed our stay and will be back!