It's a lovely room and very comfortable to have your own bathroom that was spacious and clean. The bed linen was nice and soft and the room pleasantly decorated. The location is quite good, a 7 minute walk up a hill from the metro (Ok most of Lisbon is on a hill!) but just beware arriving with your luggage, or use a taxi which is very cheap. Then it is easy to use buses to get to the centre or walk even in about 25 minutes.
The room has a little heater as I heard in most of Lisbon this is how they use heating but the room is a little bit humid and the windows open into an inner courtyard with not attractive backyards so you may prefer to keep the curtains closed which can leave it a bit dark. The kitchen is large and has good amenities and some essentials.
As everyone said and the descriptions indicates it's a very noisy echoey apartment, again maybe typical of Lisbon and the room is opposite the kitchen. I used earplugs and this helped greatly but you can consider how much privacy you want. Nevertheless I spent 5 nights and really liked staying in the room, it's amazing value and I was given lots of information and help when arriving. :)