Great place to stay!
As a couple we really enjoyed the time! We had one of three bedrooms and a shared bathroom, living room and kitchen. We really only sleped there, but felt comfortable using the other options of Artur's place :)
At night the street is still active, but could sleep well (even with open windows). The shops are really good to explore for nice and cheap drinks, foods and souvenirs. Also the house is at the bottom of the Castel, a quick walk over through steep streets brings you to Alfama and down the street is the Metro and Tram station.
All in all a really great located and neatly furnished place!