I love Lisbon and my small complaints here are no reflection on ALTIDO, who just took management of the unit. They were excellent with communication, though I am not a fan of having to go to their office to get keys instead of having the key there, as that can be inconvenient.
The building is newly renovated. This unit is on the 4th floor, and you need to walk 48 steps to get up to it, so people who are not fit should take that into account.
The walls are thin so you will hear your neighbors (the street above has a building that backs right up onto this one, so even though you're at the top of this building you'll hear people above you). The furnishings are all new, though I hope they can add some hooks and small shelves and maybe a small end table in the living room to maximize that space. The shower gets good hot water, though the pressure can die if other people in the building are using water.
You are in a really great neighborhood. The street is not very loud at night and it is convenient to walk to plenty of sights, bars and restaurants.