Overall, this was a good stay in Lisbon - it was a very clean and modern apartment, and the location was fantastic. The apartment is thoughtfully decorated - albeit almost every surface is covered with an object from Ikea or Zara Home making it difficult to place your own belongings. Check in was smooth and easy; air conditioning and elevator were helpful.
One thing that was disappointing but not a huge dealbreaker since we had stayed for only a couple of nights is that this apartment is on the top floor of the building and is in the former attic which means most of the rooms have slanted ceilings making it difficult to walk around the bedrooms and bathroom even if you are not tall. The master bedroom does not have a floor-to-ceiling wall and is open air to the rest of the apartment as well, so there is little privacy there. And the second bedroom with two twin beds has a slanted ceiling and 1 small closet, so realistically this apartment should only be used for a young couple, or a young family with small children (no more than 2 adults). The building is also used for other tourists who can sometimes be loud and there is very little sound insulation as well.