The location is great : 5 minutes from the metro and walking distance from the castle and nice areas of Lisbon. And the apartment was really clean.
But the apartment is shared with other guests, and you have to cross the apartment to go to the bathroom (private), which was ok for us but could be annoying depending on the other guests and their timing... Also the appartment smelled humidity, as the windows can't be opened all the time. But if you're ok with that and for a short stay, it's really nice.