Rio Lapa Inn is definitely a nice place to work at. It's not really a hostel, it's like a big appartment that after a while will feel like home.
Humberto is a great host, a hard working man who's always in for a joke (so you'll need some humour ;-) ) and long, (sometimes) serious conversations.
The work is not difficult- treat the place like you would treat your home. Keep it clean and tidy, prepare the breakfast for guests, cook some meals for you and your colleagues, talk with the guests...
I would definitely recommend Lapa Inn to other travelers. Thanks Humberto, Juliana and Andrei!!