I stayed 1 month at Estoril.
I worked 3 shifts of 8 hours per week: 2 afternoon shifts from 4pm to midnight, and 1 night shift from midnight to 8am. Before starting to work, the manager taught me how to use the system. The shifts consist of doing reception work: opening the door, check-in, check-out, answering some questions. It is very manageable.
At first I was in a mixed dorm of 6 people, then I asked to change to a female dorm of 6 people where I felt more confortable.
My stay was very nice, I had time to visit Buenos Aires, I met a lot of people, and the local staff is friendly.