Great location! Must be 100 restaurants and cafes within a 6 block radius. Lots of bus stops within a couple of blocks, 6 block walk to the subway. Great parks and attractions like the Botanical Park, the Japanese Gardens, the Rose Garden, and the biggest park in Palermo are within a short walk. Doesn't really get any better.
Apartment is comfortable for a couple but (like most one bedrooms) would get crowded with more than two people. Half bath for visitors by the front door is nice. Pleasant balcony for when the weather is nice. Well-equipped and the host left a starter packer of some water, instant coffee, and snacks.
Internet wasn't great but I've found that to be true everywhere I've stayed in Buenos Aires including friend's houses and apartments. More a Buenos Aires issue than anything specific to this apartment.
I've stayed in many rental apartments in BA and this one will be my first choice for future trips..