The location is really good! Very close to the metro station and to the station of the famous Tram 28.
The house is small, but comfortable for 4 people or less. The rooms and kitchen are nice. The bathroom is really small, as many people already said in their comments, but is ok for short people.
My only hassle was to get up with our big luggage, since the stairs are narrow and steep.
Overall I’d recommend “Clara’s room” (as it is stated on the front door). My family and I had a great time in Lisbon!