It’s a cozy flat in a very central location- public transport links from there are spectacular. You are 3 min walk from the train to the beach, metro, ferry to the other side of hrs river, and walking distance from the historical center of Lisbon. There is a little downside to such a central location though if you are a light sleeper - on weekend nights you can hear the music from the clubs in the area. We slept well despite that though.
Ana is a great host. Very responsive and quick to help out. Also, her recommendations were fantastic.