This is a great apartment! My wife and I spent 35 days here. It's small but well equipped to live, cook and even do remote work. Wifi is great, the bed and sofa bed are comfortable, there's a TV, an induction stove, an oven, microwave, coffee machine, washing machine, and a small private patio to hang clothes and eat outside. It has a small closet with no doors, maybe a bit small for us both, but manageable.
The location is not very central nor very touristic and it's a bit far from the rest of the city, but it feels like a very safe area and we ended up loving the near-by Campo de Ourique neighborhood (10 min walk) where you have great restaurants, shops, banks, coffee shops, a mall and more. There's also a bus stop two blocks away and no, there are no metro stations around but UBER/BOLT are very affordable (3€ to 9€ to anywhere in Lisbon) and you can also use electric bikes (0.17€/min) to discover the city.
The owner is really nice! She was very communicative and flexible. Our check-in and check out was smooth and she gave us a few hours before and after, that was very helpful.
Overall, a perfect 10/10 apartment, while location is maybe a 8/10 with extra kuddos for safety.