1. Wrong key, disfunctional magnetic keycard (frequently balky reader in elevators with restricted access floors), other guest given key to same room, etc.

2. 8/10. I cannot bring myself to trust security in a hotel with key problems: highly detrimental to the enjoyment of a stay.

3. Staff rarely seems to know how to permanently fix 'technology' problems, which is understandable but not acceptable. I am unlikely to stay again in a hotel with poorly implemented electronic key systems, and will not stay again in a hotel with key mixups, regardless of compensation or reparation. Keys either work or do not work, with the second case pointing to management issues.

Acceptable reaction times:
- key assist: the time it takes to get from the front desk to my room (5 min. max)
- additional towels: 5 minutes if the full complement of towels was not in the room (the usual case), 15 otherwise. I would say longer, but longer has usually equated never in my experience.
- addt'l pillow: sometime before bedtime. During turndown service would be perfect, but hotels with such service usually provide plenty of pillows in the room.
- rollaway/crib: I would expect those to be in the room upon check-in, if previously requested; otherwise, as above.