We stayed at Maria Terrace as a group of 7 and had a good time. :)
One of us slept on a couch in the living room, the others shared double beds or a bunk bed. The location is pretty great, just get ready to climb the old town hills and stairs to the top floor.
Then again, if you don't like climbing, then Lisbon probably shouldn't be your go-to destination anyway. :D
We used the jacuzzi one evening, which was a nice refresher. Would stay again. :)