The apartment is great for vacation but not so great if you're working. The location is excellent, very neighborhoody and quiet at night. The internet is quite slow -- 20mbps at best -- and workspace is limited, so it was a challenge for my wife and I for the month that we stayed here.
Having said that, we really enjoyed the leisure time we had here: the neighborhood is very walkable, full of restaurants, bakeries, and grocery stores. It's only a few minutes' walk to the Miradouro da Senhora do Monte, the highest lookout in Lisboa. The apartment does allow dogs which was a requirement for us.
If you're on vacation, don't hesitate to book. If you're working then consider your needs carefully.