Me and my friend stayed for 4 days in Sara’s apartment. For us it was perfect. Very central and easy to walk to most places from there. There’s a lovely new shop with organic products round the corner. Less than 5 minutes walk to the tube. Walking distance to the castle and the viewpoint.
The apartment is small but cosy and stylish and perfect for 1-2 people, newly decorated and the view to the castle is stunning.
I would recommend it to anyone looking for an affordable and central place in Lisbon.