Great experience. While not in the immediate centre, it was walkable to basically all downtown sights. Also fairly close to a metro station, and to the train stations used to travel to Belem and to Sintra.
The building is older (I believe the host said somewhere around 200-300) but the space was recently renovated and now has a brand new kitchen and bathroom, new windows, etc. The only part that still felt old was the steep staircase leading to get to the unit.
Similar to other reviewers we were left with a welcome gift of some bread, cheese, meats and wine. Plus given some suggestions on places to visit and places to eat (local favourites), which were super helpful.
Would definitely recommend, and wouldn't hesitate to stay here again if and when I return to Lisbon.