I do not know what I can add that has not already been said about Artur and his apartment. "Insert lots and lots of superlatives" here.
Great host, great communication, clean space in a central location. Wonderful recommendations and a lovely spot to stay in Lisbon if you want to explore the sights and sounds of the city on foot.
He allowed us to leave our luggage early as we had an early morning flight and allowed to check out late due to a late evening train. He was flexible to ensure we do not have to carry around our luggage all day.
Highly recommend and will surely be making my way back to the wonderful city and Artur's beautiful house.