I have ridden a Dahon Cadenza 8 as my main everyday ride since 2008. I dont fold it very often and I don't think the "lockjaw" hinge would last if you operated it twice/day. Apart from the hinge, the bike is pretty normal, except for the eccentric bottom bracket and disk brakes. 26" MTb wheels are good on road and trail and less bulky then 700c.
You may want to consider a flatpack bike, where you can rotate the bars and fold a pedal to store it along a corridor. Canondale Hooligan with BMX 20" wheels.