The keys are a little tricky. You have to press a button and wave the plastic card in front of the door. Once in the room, you have to place the card in a slot on the wall to activate the electricity. And odd system, but effective.
A nice feature of the Roma Park was that my room had a small kitchenet. I was able to keep some fresh fruit and cold water in the refrigerator. Althought I had no use for the stove, the extra sink proved useful when the bathroom was occupied.
