The stay in the apartment was great. It was clean and had the basic amenities needed for a shorter stay. I never experienced any problem with bugs, which can be an issue in BsAs. The location is in the middle of Palermo Hollywood, where a lot of nice restaurants and cafes are placed. The building only has 4 floors and feels safe. The street traffic makes some noise, even during nights, but didn't bother me much while using earplugs. The subway station Ministro Carranza is about 15 min away walking distance and several bus lines stops right outside.
Carolina is a very committed host, and she always assured personally I had a pleasant experience. For example I had some problems with the toilet not working, but she arranged for a plumber very fast and thereby solved it. She also offered herself several times to help me get around in the city. Carolina speaks excellent English, unlike most argentines.