We had a really good stay at Pedro & Claudia's. The flat is conveniently located, close to the heart areas of Lisbon. It is very easy to discover Lisbon from there.
We were welcomed by Carlos, the father, who speaks really good French. Communication with Carlos was super easy and he was very flexible with our arrival time (late in the evening).
The flat is as described/seen in the pictures. It is a bit dark inside even during the day. As in the previous comments, the staircase is really steep. We heard a bit the neighbors. It did not bother us though. We can recommend to stay here!