We are just back from a nice stay in Lisbon at Ana and Rita's place. We quite enjoyed our stay. Their place is in a great location in the Old City (Alfama). They had a friend ( Pedro) who met us and did a great job showing us the place. While a bit small, it was more than enough for us. It had a great shower, good TV and WIFI and a small CD player with a nice selection of Portuguese music.
It is important to note that there are a number of steep stairs to get to this upper apartment. Accordingly this may not be a good choice for anyone with mobility issues and/or heavy luggage. That said we are in our mid late sixties and in good health and we managed fine.
As well, print out the map that Ana sends. Our cabbie got lost and we had trouble finding it in the MAZE called Alfama (many pedestrian streets).
The great thing for us about this place was the location. Within 100 meters you had a number of outstanding FADO restaurants along with the charm of the old city.