Sam is a great host! She can give you a lot of informations what to do in Lisbon as a local. Even if she is not in Lisbon, you can contact her easily as she answers quickly.
The appartement is really well situated- directly in Alfama where you can go for a walk, have stunning views on Lisbon and go in a lot of nice restaurants and bars ( one is just on the same place as the appartement and there are Jam sessions on Saturday).
All in all, I recommend highly to stay with Sam, it was perfect!