This place is truly awesome. The floor is a little squirrelly, at is to be expected in an older building like this, but the design, spaciousness, and layout is so worth it. It's like staying in a museum, but not one you're freaked out being in. They've managed to capture original pieces of the building in a truly artful form.
The two front bedrooms are subject to street noise, but with the glass doors closed as well as the internal wooden shutters this is reduced greatly. There is bar directly downstairs that is quite popular, but they stop at 1:30am sharp. They serve quite a few beers on tap, including IPAs.
The location is brilliant, and after staying in different locations around Lisbon for a month, this area was my favorite.
The Internet was good. The water pressure was bordering on 'too good', and no issues with hot water.
Oh, the 3rd bedroom, and what I would consider the master, was windowless and in the middle of the apartment. Dead silent and as dark as you want it. Probably that best sleep I've had in months.
The furniture, though dated in many regards, added to the absolute charm of this place.
Keep in mind that there is the equivalent of a 2 to 3 story climb in stairs to get to this particular unit before a lift is available. The assistant checking you in can help with luggage though.
I absolutely recommend renting this place, even if you only need 2 of the 3 bedrooms.