My wife and I had stayed in this apartment for 6 nights. It is centrally located and the view with the castle is amazing. We were picked up by a very nice friend of Elsa and Rui. We never met them but they provided us with very helpful information.
Be aware that the apartment is in the forth floor and that the stairway is very steep. Also the shower is pretty small. None of it bothered us but it might be good to know.
Overall a very nice experience.