Since Lisbon is my favourite city in Europe, I am obviously biased... the location of the flat in the heart of Alfama was great, one feels truly part of the great spectacle. The apartment is a sweet and homely place, with every amenity you might need. The only downside is that there is no window to open (and no A/C), and it therefore feels a bit stuffy; the only way to air the place is to leave the door open for a while, but this is not an option during the night. If you don't overrate the importance of oxygen (as I do), you'll probably love it.