We had a great stay with Elsa & Rui. When we first arrived there were a few problems but Rui was quick to respond and sort everything out. The apartment is very centrally located and within walking distance of Lisbon's many attractions. As others have said, it can be very noisy at night as the bars below are open until 4 a.m. but with the windows closed this is less of an issue although it does mean it can get warm during the night!