Highly recommend this apartment! We stayed here as a group of 5 for three weeks and had a really good time. The rooms are great and spacious with comfortable beds. The kitchen is well-equipped with everything you need. Very fast and reliable Wi-Fi (which was important to us, since we also worked from there a few times).
The location of the apartment is really convenient as well - even though it is not right in the center of Lisbon, you are close to two different metro lines and can easily and quickly reach all the major sights.
Graça was a great host and very quick to answer any questions we had.
All in all, we enjoyed our stay here very much!