*almost* perfect place to stay, highly recommended.
Location: probably the best possible location in Alfama because it's only one street away from the periphery and hence easily accessible by taxi to go to & fro anywhere in the city.
Accessibility: 5 stars here for having a lift / elevator, which is a rarity in Lisbon's many old buildings.
Management: super easy check-in with someone who let us in who was very helpful.
Apartment: Luminous, spacious, tastefully decorated, just like in the pictures. Only one thing that I think they could have been forthright about in the listing: the second bedroom has a sofabed, not a bed (which is fine), but the door isn't a real door, it's a sliding door made of glass which doesn't close all that well. There is a window blind for privacy, but it's a little different than expected. However, this wasn't a problem for us.
The construction sounds that others mentioned wasn't a big deal at all for us.