I would highly recommend Ines' place!
Great location, within walking distance of lots of great restaurants, public transport, placa de comercio, and shops. We walked everywhere during our stay, and my legs are definitely more toned now - you need to be fairly active to stay in Alfama!
The flat is exactly as described and it was perfect for 2 people. The ceiling is sloped in the bedroom but not a problem at all. Very clean and tidy. The kitchen is well equipped. Wifi works great.
Ines met us outside the flat which was appreciated as Alfama is quite narrow streets. She took the time to explain the main things to do, and sites to see, and was very responsive over messages before our stay :)