I was staying in Lisbon for only one day and wanted to be close to the airport. Antonio's place is only 5 minutes away from their airport by cab and about 15 minutes by subway (time to walk to the subway included) .
The location is excellent! It's a quiet, residential neighborhood with plenty of options to eat or buy food. The metro station is less than 5 minutes from his place and you can easily get to many neighborhoods in Lisbon. My main tip is to bring a subway map with you, so that it's easier to navigate.
My room was squeaky clean and Antonio left water and crackers for me. My flight was getting in early in the morning, so I asked if I could drop off my luggage before the regular check-in time. Not only he let me drop my stuff off, but also let me check-in earlier. That was very generous of him.
Thank you Antonio (and Antonio's wife!) for being such great hosts.