I found this accommodation by pure luck by browsing the site and I must say that it could not have gone better: I stayed there for a week with my boyfriend, and everything was perfect.
The location is the best that could happen to us, in the heart of Alfama, between small shops, typical bars and restaurants and in the very heart of the city. The house is also the ideal starting point to explore many areas on foot and to easily take transport to the more distant ones.
Paula is a super nice host, helpful on everything and she recommended places and things to see, after welcoming us with a bottle of wine. I would go back tomorrow!