Luis was great. There was a minor issue with the hot water which was resolved almost instantly (gas cannister needed to be changed, totally unavoidable). The flat is spacious for the price (check the photos!). One thing I would say, it couldn't be closer to the nightlife, which caught me off guard a little because you can clearly hear it at midnight.
Location within Lisbon is great. When I left Lisbon I travelled via tram then metro back to the airport, which was absolutely fine.
Definitely recommended.