Location location location.
But that's all.
The apartment was not perfectly clean (used toothpick in the bathroom, wet floor, and some dust), beds not very comfortable, small towels and poorly equipped kitchen.
The super high price (highest per meter in portugal) is worth it only of you give location most of the weight.
We also asked where to stop the car in order to unpack our bags and got strange answers, we found a few spots 30 meters from the apartment where we could stop for 5 min and unpack ourselves.
We got used to a much more friendly and helpful portugaise hosts.