The place is amazing, big enough for group of 6 people to each have their own bed/couch to sleep. Write in the heart of Graca you're close next to the best view in downtown Lisbon (Nossa Senhora do monte) and right next to another! Close to amenities, a mini-preco with what must be the best hours in Lisbon, and within walking distance of Lidl.
Andre and Sandra are fantastic, with a guide in the house letting you know what to do in the city, and are very easy to contact. I can highly recommend their place.