My wife and I stayed at Luisa's apartment for a week. I think compared with a lot of other Airbnb options in Lisbon, hers has to be among the absolute best values for longer stays.
Top things about her place:
1. Fully equipped kitchen
2. Washing machine
3. Great location
4. Good internet speeds
It's worth noting however that if you are traveling with a lot of large suitcases, her unit is on the 3rd floor in a building with no elevator. While this was a little inconvenient for us, Luisa was such a great host she helped us move some of our things up the stairs.
Easily one of the best hosts we've had and overall would easily recommend Luisa's flat to anyone looking to enjoy Lisbon's sights for a week or more.