Fecilidade is a thoughtful host, her apartment is modern, clean, & spacious. It comes with an cool view as shown in the photos. The castle & tram 28 are within close proximity and def consider getting the travel card or 24 hr card if your exploring Lisbon.
The apartment is suitable for any length of stay it's equipped with everything you may need and there are also a choice of local
shops and places to eat within walking distances.
However I would recommend using the tram to go into the centre as walk can be a bit steep & tiring if not use to it.