This apartment is great and you should stay here! The pictures and description of the place is accurate - it is that nice and spacious! The hosts were very responsive, friendly and thoughtful and provided everything you would need to stay there.
I think the location of the apartment is good, on a quiet one-way street across from the beautiful Estrela park but it is a bit of a walk to the nearest subway station (Rato) and walking home from any of the sites (i.e. Belem or the downtown area) means a long, very hilly trip home.