I highly recommend Norm & Yamilis’ apartment! It’s located in the historic San Telmo neighborhood, with Plaza Dorrego right outside the front doors. The apartment is very spacious, well decorated, and has a lot of the historic design features but with all the modern necessities - we especially loved the air conditioners during the hot summer days. The kitchen has everything you need for cooking and there’s also a washer & dryer.
The area around the apartment is also great - lots of restaurants, bars, and shopping. You can walk to the San Juan metro station in 10 minutes and the bus stops are a short 5 minute walk.
Communicate with Norm was excellent! He checked in regularly and helped arrange our travel to & from the airports. I will definitely stay at this apartment again when I visit Buenos Aires again in the future.