I do really recommend Joana & André as a destination in Lisbon.
André was really nice and friendly, he recommended me with some local restaurants and sites for sightseeing, it was a please stay in their apartment.
The location is really convenient since it located in the middle of two metro line, one of them is the airport metro, all the way to the Lisbon international airport.
Friendly atmosphere, nice host! I would definitely choose their apartment for my second trip in Lisbon.