The location is really perfect for an experience of the oldest and most picturesque historical area of Lisbon. Imo, it is the best place to be. Be prepared that an historical area means narrow streets and lovely tramway means tramway's noise: till 11 am especially in the rooms on street side, you won't ignore when it is passing by.
But it is the counterpart of having the pleasure to stay at walking distance of all the most genuine and historical part of Lisbon.
The flat is perfectly staged for AirBnB's stay, as appearing on pictures.
Communication is easy and João efficiently helpful.