I'm looking for the easiest to use super-auto - or to be more precise, the easiest whole bean to single cup of drip or Americano - on the market for my Dad. Ease of use is paramount. I want something where he can push a button and a single cup of (good) coffee squirts out, no muss no fuss. He mostly drinks drip now, but could convert to Americano style. He can handle re-filling water and coffee bins and emptying grounds, and a weekly rinse, but bigger maintenance like descaling will probably be deferred until I visit every 3 months or so. Complicated menus or undecipherable blinking lights will throw him off. Any suggestions?