We like this set-up, made out of what appears to be a stripper pole (those Swedish are so forward-thinking!) and some brackets. It taps into the last bastion of spacial real-estate in an apartment - the upper wall, and looks pretty sharp to boot. As a bonus, we think you're bound to get pretty ripped having to lift your bike up there to the top spot.
And fine, so maybe it's not actually a stripper pole, but we're sure if you have a spare one that would work, too.
Check out the full instructions here.
Image: Ikea Hacker