Great stay! The flat was accessible for us before 3pm, which was very convenient for us. It is located in a perfect space, you have access to busses (walk 5min) and to metro and trains (walk 10min). But yes, it is a rather loud environment. Alfama is the "Fado" scene and if you want a quiet sleep in, you might be enerved by the livley lisboans. We enjoyed our stay in "our" flat very much.
We had no problem with the Wifi!