Great place to stay. Quiet at nights so you get a good night's sleep. Very clean too. Quick walk to various metro stations and the Edward VII Park. Plenty of great restaurants around as well.
As an aviation enthusiast, I don't mind it but the unit is located directly below the flight path of arriving and departing aircraft into Lisbon Airport. Most of the traffic ends around 8pm but there are some late night arrivals up until midnight. I didn't find this troubling at all but if you are a very light sleeper or trying to go to bed early, it could be.