We loved the apartment and the location. The hosts were very informative and friendly.
The only negative aspect was the acoustics of the building. In the bedroom, you hear everything that is said or snored in the bedroom above, and when they drop a shoe or something on the floor, it's really loud. And can easily keep you awake. The hosts informed the people in the apartment above. (Earplugs were supplied upon arrival.)
We've been to Lisbon a number of times before, but this apartment and location really struck a chord.