We had a great stay in late August 2018 for 4 nights with 4 people. The apartment was very comfortable and large with a modern kitchen, large table and plenty of beds. The view is better than in the pictures you can see water in two directions, and the Lisbon Se church is almost right below you. Patricia who works with Maria met us and gave us great advice about where to go, the city, and general insights. Note it is 4 steps up to the elevator - no problem for us.
The location is what made it great. We walked everywhere. (which we tend to do) and everything seemed to me 5-10 min walk away. Only used Uber twice. The castle is right above with three viewpoints on the walk up, otherwise the trolley to castle runs right by the door. Biaxa district is a 5 walk as is the waterfront. Overall a great apartment that I would recommend to friends.