Great little studio (emphasis on little) about 10-15 minutes walk to the Lisbon airport, one of two reasons why I chose it---the other being it has a combo clothes washer AND dryer, quite rare in Portugal it seems. This proved convenient for getting all my clothes washed before leaving Portugal, although the unit, along with the Airbnb is very small so several loads may be required if you use it. Again, this place is TINY and with the two very small windows (which can be tilt-opened for air, but you can't see out of them) I could envision this place being a little claustrophobic for some people. I think it's suitable for one person or two people who really like each other, and even then I wouldn't go longer than a few days.
The place is clean and well appointed with three (!) doors and respective individual keys to access, a bit like the opening sequence in the old TV series Get Smart. The location is basically a regular Lisbon suburb and there's not much around beyond apartment buildings and similar residences. The closest Metro station is Aeroporto, which is pretty good but not terribly convenient.
Overall, for what it is, a solid little place for a short stay near the airport. The host is very friendly and responsive if you need anything. Check in was a little tricky (I met the cleaning lady as she was coming out the door and she showed me around) but worked out fine.