We had a great time at Elsa and Rui's place. The apartment was cosy and well situated. The communication before our arrival was great and we received a list of places to visit. Carlos gave us a nice ride from our previous hotel, full of interesting facts and tips. It was very helpful. We also had a good use of the bikes and pocket WiFi.
For the cons, we'd point out the small shower and the weak isolation from noise. Fortunately, the upstairs neighbor doesn't go to bed too late, so it's only been annoying during our few tentatives of naps.
This didn't affect at all the great Lisbon experience we had and for which we warmly recommend this apartment.