Carla and Olinda prepared the apartment for us (3 people) and we have been very well welcomed and supported during our visit.
The castle and some sightseeing sites are very close to the apartment, the location is very good.
There is a tram line passing in front of the building: it was simply great to take it and enjoy the ride from Alfama to the city centre and beyond. Please don't worry about the possible noise, you can barely hear it!
We were 3 visitors, but the apartment is big enough for 6!
There is an inside terrace that unfortunatly we could not use because of the weather (december :)).
I really reccomand a stay at Carla's.