Great location at the heart of Lisbon. Apartment is spacious with good kitchen and living room. Had a small issue with the toilet that was fixed the next day. Beds are comfortable.
The check in place is not close so the flat, but is accessible via underground, so you need to plan your way from the airport. Check out was simple, just leave the keys.
Staff is friendly and you can leave you bags at the check in office for a small fee.