I and my wife enjoyed our stay at this place in Lisbon. It's located in the central downtown Lisbon (lower), in a few minutes of walk to a metro station, buses and "a Praça do Comercio". It's quite quiet at night, especially for a downtown. You'd hear the church bells toll daily, starting at 8. The studio is quite comfortable for two and we really appreciated a small espresso machine, doing a suprisingly decent job (for a small machine).
The hosts provided a very extensive list of local tips. You would be able to arrive in Lisbon without doing any research and just go by these tips.