Great place to stay. Centrally located within walking distance of tons of sites, restaurants, cafes and nightclubs.
David is extremely friendly and responsive - returning messages rapidly.
The space is spacious for one to three folks for several days.
There are two bedrooms both have very comfortable beds and blackout shutters to minimize noise and lights.
From a comfort perspective, the bathroom is nice with hot water. The air con works extremely well (we had to turn it off sometimes at night). The kitchen has all that you need to cook meals (pots/pans, dishes, coffee maker, microwave and toaster). Towels and linens were clean and plenty. And the place is secure.
The apartment is located in the festive barrio alto neighborhood. While the street is noisy I found the apartment insulated enough to drown out the sounds of the local environment though I recognize that everyone has differing levels of noise sensitivities.
I would stay here again while in Lisbon without any doubt.