Frederico and Joana are great, thoughtful hosts. Because of the airline, I had some trouble flying to Lisbon, but I was always able to reach them and they were really dedicated to reply my messages and help anyway they could. Top hosts, for sure.
Their apartment is really well located. The place is huge and accommodated my group (5 people) with room to spare. The beds are comfortable and everything was very clean by the time we arrived. The only aspect there's to flag is that the building has no elevator and the apartment is on the 4th floor.