Filipa is a great host. She was super friendly and flexible, providing me with lots of useful information about Lisbon and helping me out with a taxi. It was a real pleasure to meet her.
As for the apartment itself, it is a perfect place for a person interested in exploring Lisbon, as it has a great central location and also there are a number of tram and bus stops in the square just 3-5 minutes away from the apartment building. The castle is almost round the corner and quite a few museums and places of interest are within walking distance. There is also a good supermarket nearby.
The flat is fully equipped, clean and light. However, there is not central heating or air-conditioning, which might be a problem for some, but I was not bothered much.