You can go without any hesitation in Benjamin's flat. Benjamin is a very kind person, available and attentive to your questions. He gave us a lot of advises and stay available. The flat is very calm, pretty, clean, and well situated in the old part of the city (Alfama). Keep in mind that after 11PM; some tramways are not available anymore, but you have just to walk for 10 minutes to reach Alfama.