I would not recommend this apartment because the bathroom is really small! I'm 1,74m and couldn't sit right on toilet (only 45 degrees to side, head and knees would hit the wall). The sink is as big as at the dentist and turning around in shower nearly not possible. Water doesn't drain off well, so you need the wisher and then always hit against all walls. The provided towels don't absorb any water, that was very annoying!
Stairs to the upper bed are really small and dangerous espacially when you want to go to toilet during night. The matress is hard and has low-slung without any slatted frame. However in middle of the matress you'll sink a bit down.
Location is nice in Alfama but it's also a disadvantage. Sleeping in the end of juno 2022 wasn't possible before 1 o'clock due to loud music and noise and bad isolation of windows.
Wifi in the bed is very poor, my smartphone always switched back to normal mobile radio and espacially in bed it would be important!
Self Check-in and out was fine, all the information on qr-codes great.