#2 Does the steam from brewing affect the programmable screen?
No - not at all. It recommends not to have it under a counter
during the brew cycle, so I pull it out from under my cabinet until
after brewing. There's a small vent on top.
You an leave it on warm plate for quite awhile but if you are
finished for the day, clean it up and wipe it down or unplug. If
you unplug you have to reset time.
I am very satisfied with this coffee maker.