This apartment is all about location - it is right on the plaza, and so very close to the streetcar, busses, the Metro, the Rossi train station, and one million restaurants. There's a good grocery store two blocks away, and a "meh" one right around the corner. The AC is great, the beds are comfortable, and we found it very quiet. We really enjoyed our stay there (there were four of us).
Small downsides: the apartment is not stocked with any staples, so you're going to have to buy your own food seasonings, coffee pods, laundry and dishwasher soap (although we left some of that for our successors). The air conditioners, dishwasher, and washing machine take a little trial-and-error too (including getting the electricity switches right). There is no dryer, so you get to drape your drying laundry over the furniture and the small decorative ladder.
But these are small nits. This was a really good place for us to stay during our visit to Lisbon, and we'd definitely stay there again.