I was very torn between 3 and 4 stars. The apartment is in a fantastic location, close to shops, restaurants, a pharmacy and public transport. For 6 people it was more than enough room, even with the top floor bathroom and bedroom having a low ceiling. It was very clean as well.
The issue was the stairs. It can’t be helped that the apartment is in an older building without a lift but climbing up to the top floor a few times a day was a real pain. On top of that, I was very surprised there was no AC. I think this should strongly be considered, especially after walking up all the steps it would be nice to enter a cool apartment. The week I was in Lisbon was uncharacteristically hot even for summer but either way AC was very much needed! The fans did very little especially during the day.