Gustavo is simply the best host possible. I felt completely at home in his clean, peaceful, cute and well designed flat.
He's both respectful of your agenda and helpful with anything you need. You have a quiet, lovely room to yourself but also friendly company when you'd like it.
The room and bed for the single room (where I stayed) are both small, but so well decorated and designed for efficiency that you don't even notice.
The neighborhood is a total hill, but descend down any one side and you find vibrant, central, fun areas.