We stayed at Diogo’s for one evening to fly out of the airport early the next morning. Madalena, Diogo’s mother coordinated our arrival and let us arrive an hour ahead of check in. Madalena was so kind and welcoming. She showed us around their home and even had a fan set up for us to cool down the room (Lisbon was in a heat wave). She has two cute cats, which are not allowed in the Airbnb room. We did not spend much time in their home and went into the city until the evening. The city proper is about a 20 to 25 minute Uber ride (~10 €). Oriente train station is an 8 minute drive. You can legitimately walk to the airport from their home in about 10 to 15 minutes (though our Uber driver told us it could be confusing for pedestrians). The Uber to the airport was 4€ and was around a 5 minute drive. This was all very convenient.
However, there are some things to note that I believe have not been mentioned in any previous comments. If you are sensitive to smoke I would not suggest staying here. Although you cannot smoke in the home, the smell of cigarettes hit us as soon as we walked in and was even present in our bedroom. As it is a shared space, it may not be as clean as you would expect for a private stay. I felt that way about the bathrooms. Lastly, I did not find the bed comfortable at all. Fine for one night but I would not recommend more.
Overall, if you are flexible and looking for something convenient, I would recommend. If you are more sensitive to privacy and certain scents, I would not recommend. I am sorry to bring this up because the hosts were so kind and friendly, but I do not think this is highlighted at all in the reviews.