I stayed for two weeks for a work trip and enjoyed it. Recoleta is a very nice and safe neighborhood, with tons of restaurants and shops. There is a metro station just around the corner. The building has secured access and a friendly guard. You reach the apartment by a small elevator or a few flights of stairs.
The apartment was very clean and spacious. It has comfortable beds, dedicated workspace and 3 balconies. Internet was fast and easily handled video calls. The kitchen was fully equipped for cooking (full set of plates, glasses, silverware, knife and cutting board, pots and pans, gas oven and stove, full-size refrigerator). Plus a clothes washer, drying rack, and iron/ironing board.
Note that it is on a busy street in the middle of a city, so you will hear traffic outside. I also arrived in the morning and had to wait a while in the lobby to receive check-in instructions. Otherwise Barbara was very friendly and responsive. She had the apartment cleaned mid-stay, very kind.