The key thing to know about Constanza's place in Valle Nevado is that it is SMALL. There is no desk, table or chairs. Just a bed. So, yes, you can make a very simple meal in the very simple "kitchenette", but you will eat it laying in bed. My hotel room in Santiago was bigger.
Also, the reception staff of the building are very nice and helpful but they speak almost no English, and I speak no Spanish. And there is no wifi in the lobby, so communicating was difficult.