Stayed at Joao's apartment and it was perfect for the two of us. Easily walkable to all areas of interest in central Lisbon and only a few minutes to the metro for anywhere further afield. We had a bit of difficulty with the keys and locks to get into the apartment on the first night, so if anyone else has similar issues, don't worry they are the right keys, you just need to get the knack! We didn't meet Joao but were welcomed by his sister and he was always contactable if needed. Would recommend.