I stayed in a room where there was no window and I had the best sleep in the entire Lisbon trip (one week). I guess the darkness helps. No much noise from the street either. I couldn’t say for other rooms, but mine was nice and quiet. Because of high ceiling, the room felt spacious. An extra blanket was a huge help ( in February, it can get chilly in the night). A hair dryer was also a huge plus. All in all, a very nice stay. Plenty of Fado bars, cafes, restaurants with in a short walking distance.