Lovely apartment. Very clean and well equipped, comfortable bed, and good air conditioning upstairs and downstairs. Only minor criticism is that the trams are loud (but stop overnight) and there is some noise from other apartments in the building. This was not an issue for us but might be for early sleepers.
Great location. The 28E tram line stops just outside, and it is a ten minute walk to a metro station (Baixa-Chiado). Also near Bairro Alto for night life, the riverside and the Santa Catarina viewpoint.
Check in is very easy and communication excellent.
All in all, completely recommend.