We had an awesome time staying with Carlos and Patricia. They are very kind, helpful and made sure we had a great time. They gave us some very good tips about what to see and where to have some good food. Additionally, they cooked for us on the first night and we went out for dinner on the last one.
The room we stayed in was spacious, clean and the bed was super comfortable. Their flat is ideally located in Santiago downtown, you can easily go to the main touristic attractions by foot.
We strongly recommend staying with them if you're visiting Santiago :)