Joao's apartment is just lovely with a magnificent view from the balcony and it has all the equipment of convenience to make a great stay! It's situated in really nice parts of Lisbon. A bit away from the most touristic areas though it's still close to both Cais do Sodre (Connects you with trains to Cascais, Estoril etc.) and the "downtown" area.
I definately recommend you to stay in this apartment while visiting Lisbon!