Truly gorgeous apartment with unbeatable location. If you plan on visiting Lisbon, I can only recommend this place. You have several sites of interest close by, delicious dining in the surroundings, as well as a supermarket and especially access to public transportation either by tram or bus. Also the neighbourhood is very quiet and you have a nice lookout onto a large green area.
The only issue I found might be privacy in the bathroom, for the door is made of glass and has no lock.
But I think you cannot find a better place to stay when visiting Lisbon.