We made a last minute reservation for a one night stay before going to the
airport next morning. The apartment location is not bad: good authentic neigbourhood, walking distance to Marqués Pombal square. The host did a great job of renovating apartment, it's clean and vrry well equipped (coffee machine, dishwasher, nice furniture).
Now about the negatives.
It was a bit noisy at night because of the planes landing at the airport (they fly really low even at night when there supposed to be a curfew).
The apartment is in a semi basement, so there is very little natural light.
To sum up, an okay place to spend a night or two, but I wouldn't stay there for a longer period.