I lived here 2 months.
Let's start with the one negative thing:
The trash collectors are loud. Usually they come fast and go fast, expect one day a month. I don't know why. If you need to be for sure asleep at 22:00 and have a light sleep, then this could be a problem for you.
I really enjoyed my stay there. The apartment was clean and the furnishing nice. The style fits nicely together and everything is well composed. I loved the bed, it was so cozy. One whole body mirror and sotrage for my cloths was nice. The working place was great with enough space. I mean, a working chair would be great, but for an airbnb chair my back and neck stayed fine.
The owners are super fast to anwser and will help you where they can. They are also really lovely people.
The apartment is in the Moscavide area and it is its own world. You got the main road with your cafes and supermarkts. You have a lidl and factory fitness. But the best part is the little shop right in front of the apartment. You get your fresh vegtables, bread, coffee etc. The owners are super friendly and help you with what you need. In the restaurant over the street you could also get a traditional portuguese lunch.
You got the train station moscavide that brings you into the city center or to the outskirts of lisbon. The best transport is the red line metro station. It brings you to everything in the center. Just get to san sebastian. There you have a park and just go up there. There you have a nice view to the river and a good start to bairo alto, baixa, alfarma etc.
The Parque das Nacoes area is just over the bridge. There you got the expo area with the tejo river, skatepark, calisthenics park, bmx park, gras to lay and river side to walk. If you want, you could also go to the oriente station with a shopping center with a cinema or to the Oceanarium and watch some fish.
I think there are somewhere people in the building but they were really quite. Think I heard two times people.
Overall it is an awesome base to discover lisbon and I would totally come back. It was a great time. Thanks.