Just spent 4 days at Mariza & Diogo's place and our staying has been very good. The flat was clean, essential, quite (in spite of the loud music coming from the streets during theS Saint Anthony festivity) and, actually, modern ( Alfama is the oldest area in Lisbon). It's perfect for 2 people. The weather was really hot but keeping open the windows and using the fan gave us enough relief. Just bear in mind that the area is full of ups and downs, stairs and narrow roads: travelling with big luggages can be an issue, as Uber cannot stop directly in front of the flat. But if you are willing to walk and explore, Alfama is the best place where to feel like a local and enjoy the spirit of the city! I would definitely recommend it :-)