We stayed (4 people) in Joana's place for three nights and we loved the strategic position with its great view on Tago River and the rooftops around, the stylish flavor of its interior design and the kindness of Joana and her mom Marta who welcome us introducing to the house: it was clean and very well furnished of everything you might need.
Expect some stair steps to get into the apartment but it is what you need to keep in mind when visiting Lisboa, a roller-coaster!!! But it is really worthwhile!!! I would recommend this stay and I definitely will come back next time.