Antonio is an absolutely great host. The appartment is really perfect to visit Lisbon. You can walk to the barrio alto and take the tram 28 right at the door. Taxi is really cheap from aiport to there (10-15 euros). Reception was absolutely great although we arrived midnight and Ana was really helpful all the time. The building is fully renovated in an old part of the city with 24/7 security.
As a comment I recommend the use of the sofa bed for max one person or two children. It was good for me but maybe for a couple or bigger person a bit small. The double bed is perfect. We even had a very nice wine as his treat. One of the best apartment I have stayed!