The apartment is very nice and with a wonderful view of the castle and the river. On the other side, there are some difficult steps to arrive at the 4th floor where the apartment is. But the fatigue is then rewarded by the views!
The owner Antonio is very friendly and gave us so many information about the city and what to do during the period when we were in Lisbon.
Just a little point out...the taxi is cheaper than 20 euros for going to the airport ;)