The four of us had a lovely stay with Raquel and Gonçalo! They provided us with many great suggestions on where to visit and eat. Also, the location was great and so was its value. The kitchen had enough supplies that we were able to cook dinners and breakfasts (two burners for the stove), and while the bed in the room with the TV was small for two people, we did not mind.
As other comments have noted their neighbor is somewhat "unhinged" for lack of a better term. We knew what to expect going into it, and it really is just as described: absurd reactions for minimal noise, like opening a door. She will watch you leave and enter the house, hoping that you will make a noise so she can complain and threaten you with the police. Overall, we felt bad for her and all her trips up the stairs and refused to let her ruin our trip. With the unpleasant woman aside, which Raquel & Gonçalo have no control over, we found our stay quite delightful. Any issues or questions (such as how to fix the fuse when we accidentally shorted the electricity--which was an easy fix thanks to their guidance) were quickly answered by our hosts.
Thank you for letting us stay in your lovely space, we hope to visit Lisboa again soon!