Frederico and Manuela appartament has been a great location.
You can easily take the metro from/to the airport a few minutes by foot and even take the historic tram to go to the center of Lisbona. If you prefer to eat something nearby there's plenty of restaurant. As Frederico suggested us, check the Market!
The check in was really easy and comunications with Frederico has been great, he always responded really quickly and has been really nice. We asked to leave our luggages there a few extra hours and he quickly organized to help us. Even the cleaning team was really nice.
We really appreciated the appartament (and even the wine bottle they preparared for us). 100% recommended for your stay in Lisbon!