Paula e Zita's place was just perfect for our stay (3 nights in Lisbon with my 2 kids). The situation is near perfect: in a living yet not too noisy area, close to the center and 5 to 10 minute walk from major subway / train / bus stations.
We didn't have the opportunity to actually meet, but Paula and Zita were really warm and reactive via messages, and even prepared a homemade chocolate cake to welcome us. They also provided very insightful info for touring the city.
As advised in the apartment details, the 3 floors steps to reach the apartment are pretty steep, but nothing my 3yo son couldn't achieve... And that's anyway a nice teaser for the Lisbon hills !
All in all, everything was perfect, I highly recommend this place!