Samuels flat is perfect, small but just right for four people. I would recommend staying there, especially during the week; Friday and Saturday night are very noisy ; ear plugs really help. The street is ideally positioned for good bars and small restaurants. Bica is a really nice area, and we walked everywhere.
We joined a very good street art walking tour on Saturday led by a very enthusiastic tour guide, which started from the large square nearby.
I look forward to returning to the flat and lovely Lisbon soon.