Guys, believe it or not some people don't consider their bikes proper "home decor". Especially girlfriends/wives.

I'd consider disassembling the bike and placing it in a soft case like this.

It takes up less room than the fully assembled bike and it's easy to move from room to room or garage.

EDIT: I would NOT store the bike outside.

Also, if space is really, really limited: If you put the bike in such a bag/case you may be able to convince a friend/co-worker/parent to let you store it in their garage till the spring.