We really enjoyed our stay at Francisco's place.
Location wise it is the perfect place to move around the city of Lisbon, with the old 28 tram stopping literally 2 minutes away from the flat and the city centre in a walking distance.
The only little trouble we had was the cold, even though we didn't spend much time in the flat, being to busy exploring this amazing city.
Lisbon houses don't have a heating system (which we understand as it never really gets cold there), but having had even a small electric heater would have been a great thing.
Anyway, we would recommend Francisco's place to anyone looking for a nice place to stay in Lisbon.