The location is excellent, walkable to nice restaurants, Praca De Commercio.
This space is listed as a 2 bedroom. The upstairs room can be considered more like an adult bunker bed. The supposedly "mezzanine" room is a vaulted space with about 2+ feet (0.7 meter) high walls and the highest point is about 5'6"(1.7 meters) high with a tight stair leading to the upstairs space. If you are ok crawling into the bed and ok with tight space, it is comfortable.
I communicated with Liliana before posting this review. Looks like both AirBnb and local regulations approved this as a room. Personally, I cannot understand how to call this a room where you cannot stand on your feet around the corners of a room or let alone the bed.
The downstair room twin beds are comfortable for two people. Our kids had a comfortable stay.
The kitchen is modern with full utensils for a comfortable cooking of your favorite meals.
We had a great time in Lisbon!