Just stayed 4 nights at Nic's beautiful apartment with my family of 4 (2 adults, 2 young children). The apartment is very stylish and has interesting art throughout. The large living room is certainly a focal point and a wonderful space to relax and enjoy the breeze through the open french doors looking out over the iconic Ave. de Mayo. Perhaps not ideal for toddlers due to all of the art pieces and a few steep stairs, but we managed by placing some of the decorations/art on higher tables and blocking the stairs so our 1.5 year old son wouldn't try to climb them.
Loved the exterior of the building and cool antique elevator (that works great and our kids loved). The apartment is very easy to find for Uber drivers, etc. A small grocery store is located directly across the street, a large grocery a couple blocks away, and a subway stop is literally right out the building's front door. Children's playground just in front of the capitol building next door. Location is central to a lot of sites and restaurants, although perhaps not as much of a trendy area as Palermo/Recoletta (but both are very easy and cheap to reach via Uber or taxi). Wifi internet was fast and reliable. Check-in with Rafael (who is a very nice guy) was a breeze, and check-out very simple (just left the keys and locked the door).
Highly recommend and would definitely stay at Nic's place again on our return to BA!