We landed in Lisbon at midnight and still had to travel to the flat but Rex, the owner, was kind enough to wait for our arrival and brief us about the flat.
The place was clean, had fresh towels, quite central and most things are in walking distance.
3 things may be improved:
The front door is a bit jammy, there's a trick to it where you pull the door upward and lock it (easier with 2 people).
The shower doors don't close properly so the floor gets wet (just mop up).
There is no lock on the bathroom but as long as you have trustworthy friends you'll be fine.