Small, clean and safe. Suitable for one person, or two persons if you don't need much space.
Check in was easy and everything worked out fine during the stay, but the one question I asked didn't get an answer.
Walking distance to the metro an also to other parts of historical Lisbon if you don't mind a bit of walking up and down narrow streets.
Maybe avoid some of the streets in the neighborhood in evenings if you are alone, because felt a bit unsafe but it's possible to access the apartment from the streets above.