There are three things our ideal office kitchen would have (if we had the money for it): 1) Easy to clean, 2) hidden wires and 3) has one of these Air Uno Parsifal glass kitchen hoods that disappear right into the table when not in use.
The seamless design of the Parsifal raised vents offer an ideal alternative to traditional entilation hoods. You have your choice of pickings from 6 models in varying widths in black or white glass. Just a word of advice, if you're looking to seriously install one of these, you'll need to plan out your kitchen to route the required external motors. The Parsifal even comes with a handy remote control which allows control of the 4 speeds, automatic switch off, and a filter cleaning indicator.
If you're in the UK, you can pick one of these up for £2,400 to £3,600.