I can only confirm the amazing ratings and comments below: It is a pleasure to stay in the flat of Inês and António. Maybe some notes that have not been mentioned yet: No need to worry about the fourth floor - the stairs are reasonably high and easy to climb. Parking was way easier than expected: Either on the street at Cais do Sodre (around Portugalia restaurant, free after 1900 and on weekends park) or in the garage at Calcada do Combro 74 for (guarded, 13€/24hrs, if you need something throughout the day). António even researched some more options and then drove me there to check it out myself - just one example of the excellent hospitality! Other examples: They gave us dedicated hints on where to go with children, they let us in early because or flight arrived in the morning, they put fresh flowers in every room and they welcomed us with a breakfast. When they invite you to come by, just do it - very very friendly people :-) The price seemed a bit high for us at the first sight, but then it was very worth every penny (other people already highlighted cleanliness, speedy internet, warm water without any hazzle, good public transport etc.). Regarding noisyness at Cais do Sodre: The bedroom with the window to the front was quite noisy on Saturday night - all other days were fine. The bedroom with the windows to the back were all quiet.
Summarizing: We loved it :-)