I think a toaster in a cupboard would be OK if there was a lot of clearance (esp at the top), and you obviously left the door open when you cooked.
Actually, I did a thread on this a while back. If I did one of those Magnet challenge thing of 'find one thing that defines your kitchen', for me it would be my slow cooker. Never see those in the glossy catalogues or magazines!
If I wasn't intending to move again (i.e. I could be as batty as my heart desired), I would get 90cm deep work tops, so that the back 30cm could be 'appliance space' with my slocker, breadmaker, steamer, espresso maker, kettle and toaster proudly lined up like the loved and appreciated members of the batterie de cuisine that they are. Then I'd either leave it be, or p'raps do some kind of screening or tambour shutter.
This would leave full 60cm in front prep space (i.e. prep directly in front of the appliance to prevent wasted trips). Another benefit is that it would be unreachable for kids. I always worry about that - most of the appliances get hot and hang around unattended (e.g. Slocker full of 5l boiling stew for 10 hours ),
The cabinets underneath would be a bit of a challenge - you;d need some decent ones with those pull out gizmos.
Now why won't someone build me one?
(p.s. I think those hot water taps are awful. You have something that looks like a normal tap ready to instantly dispense water hot enough to strip the skin off your hand lying in wait for unobservant child/inlaw/granny/visitor/au-pair. And it dispenses at 98 degrees - so not hot enough for tea. And no handy cooled boiled water for babies.)