Good: Spacious place, good rooms and excellent location, right at the Sé Cathedral, and public transport at doorstep to the castle and downtown Lisbon. There are many restaurants and a convenience store really close to the entrance.
OK to live with: There is a small stairs to go the the apartment (no accessibility... but to be fair, Lisbon is not an adapted city at all), and no air conditioning (but really not needed: we stayed during the high Summer temps and were OK with the provided vents and opening the windows... no mosquitoes there).
Good place to stay, and I recommend it.