Although this flat is in the heart of Lisbon and nicely decorated, it's located on the 1st floor over two incredibly busy streets. The constant trafic, day and night, with cars, motorcylcles and many trams kept us up all night and we had to move the following morning after a sleepless night.
Alexander was very nice and gave us a full refund. He has plans to put in noise-proof windows.
Before booking, I suggest you check if he has changed them.