My girlfriend and I stayed in this flat for over two months while we worked in Lisbon. It is well located with the subway 10 minutes away, and bus station across the road. Nice restaurants, markets, pharmacies and cultural points all nearby. It is well equipped with kitchen utensils, coffee machine, toaster, washing machine, dishwasher, microwave, etc.
On the other hand, the cleaning left a lot to be desired, especially during covid times. On the surface it might have seemed clean as we arrived, but after opening doors and cabinets we had to clean everything before using, including a large portion of the kitchen cutlery, and some of it we weren't even able to clean properly.
Additionally, I have to point out two drawbacks to the flat that make me not want to come back to it in the future, the apartment suffered daily from a fetid smell that seemed to come from the sewers (I'm not going to describe it in detail but it was foul), and it seemed to be triggered when using the faucets/shower in the bathroom. Also, the flat is on the 5th/6th floor depending on which side of the building you come in through, without an elevator. Tough when arriving from work, and highly discouraging to leave the apartment to go the supermarket when you're faced with going up the staircase on the way back.
Bottom line is, I think it's a fine stay for tourists/short-term. I can't however recommend it for a long-term stay.