A friend told me about a machine that you fill with water and beans and just brew a cup at your convenience - machine will indicate when you need to re-fill with water and beans - anyone heard of these ??
No, but it sounds like a joke. I know some coffee lovers want convenience, but when will they understand you usually don't find great coffee and convenience together? From what I've read most grind-n-brew machines are crap. Just my brutally honest opinion. Later!
The Capresso CoffeeTEAM S does part of that. You fill with beans and water and it will grind and automatically start the brew cycle. You'll still be required to dump the grinds and refill with water after every batch.
The Capresso is the ONLY grind-n-brew machine that is regarded as being decent that I'm aware of, but the OP inquired about something that will do this for "a cup at your convenience." I know of nothing that will do this on a one cup at a time basis.
But you're right about the cleanup/maintenance, which is something most people don't like to bother with. I guess that's why idiotic pods and capsules are still around. I guess not everybody is a purist, right?
Hell I think I'm going to go all-out-purist and grow/roast my own beans, smash them with a stone and brew them in a sock. How's that for convenience? Later!