We had a lovely stay @ Margarida's place. The communication was very fast and easy. When we arrived Margarida showed us the apartment en gave us a lot of good tips for our stay in Lisbon. She brought us pastel de nata and breakfast for the next morning, really kind.
The location was really nice, in the center, everything is walking distance.
For light sleepers: bring your earplugs! There is a lot of noise from the street and the upstairs neighbors. The first night it felt like the neighbors we're moving or redecorating at 4 in the night. The other nights were better but still a lot of sounds.