A great place to stay if you are mobile. The main door to the apartments is located on a narrow pedestrian street up quite a number of steps, near the Museu do Fado (so not far from the castle and other sights). It is accessed up a step off the stairs forming that street. The half of the door that opens is narrow and strongly sprung. I expect the other half of the door could also be opened to allow larger baggage to be taken in but I'm not sure. The apartment is then accessed via a narrow staircase. Directly inside the door is another steep flight of stairs. None of this was a problem fur me and I would certainly stay there again but I mention it in case it might be a problem for others.
The apartment itself was ideal for me; small but clean and tidy, with good views to the estuary. It is essentially one room, which includes a small kitchen. The bathroom is partitioned off with partially obscured glass, which also appeared to have blinds that could be pulled down on the outside (though I did not use them, as I was alone).
The bed is comfortable and the bathroom very small but well appointed.
The hosts were great; my arrival later than anticipated did not seem to be a problem, as we were in touch by SMS.
I would certainly recommend this place for anyone mobile enough to access it!