I stayed at the apartment with a friend and we were able to have our own bedrooms, which was nice. It was a spacious apartment with all the basic things you might need. The rooftop patio was lovely and a great place to enjoy a view of the river and bridge. It was very clean, however the provided towels smelled like mildew and were unusable. Luckily, I had packed my own. The beds were comfortable. You should note that there can be some noise from the stairwell and neighbours, so be prepared for that if you're a light sleeper. Also the stairs to get up to the upstairs bedroom and patio is very narrow and winding. it was difficult to bring luggage up there, and I wouldn't recommend for anyone with mobility issues.
The apartment was well located for a stay in Belem, within short walking distance of the Palace of Ajuda and the famous Pasteis de Belem. Getting to the main tourist areas of Lisbon or the airport was just a short car ride away. We stayed here on our last night in Lisbon before heading home for a chance to see another area of the city and easily visit the Torre de Belem, Pasteis de Belem, etc., so the apartment was great for that. If you are visiting Lisbon and want to be within walking distance of all the major tourist attractions and fun neighbourhoods, it would be best to stay in Alfama, Chiado, or Bairro Alto.