I recommend Le Flat as an excellent place to stay in Alfama! Gorgeous views of the Tagus river (and some cruise ships), art all around, easy access to Portas do Sol, Tram 28E, and even a public elevator to Miradouro de Santa Luzia (which I only discovered my last morning there!). The apartment itself is trim, tidy and cute. The space is terrific and so atmospheric for a solo traveler or a couple. Watchouts but not showstoppers (for me at least): steep stairs up to up to the apartment and the ladder that leads up to the loft inside might be hard for some to navigate (I got used to it pretty quickly); key is quirky and needs a specific touch to work (the hosts' friend was there to let me in and show me how); upstairs and downstairs lights need to be synchronized to work (hard to explain, but easy to figure out!); wifi a bit spotty at times. Otherwise, Ines and Martim and their friend Lucia were quick to respond to questions, provide local recommendations, and were super gracious to have water, wine, and snacks ready upon arrival! Come feel a part of the neighborhood here!