We had a great stay with Goncalo and Miku! The location is amazing - centrally located in historic part of Lisbon, and the building is on the small cozy square with great restaurants/cafes on it and many other restaurants near by. It is a walking distance from many historical sites.
The apartment is very nice - great layout with nice views of the city, very clean and with many details thought through by the hosts. The hosts are very responsive, proactive in communicating and pleasant to deal with.
If you are coming by car - you may want to get exact directions from the host where is the best place to stop the car and unload the bags as there is no access by car to the building entrance and the streets around it are busy with cars and tourists. Also - the building does not have the elevator - so, keep this in mind if you have heavy bags.
Overall - great stay and I would highly recommend the place and the hosts.