How about your bedroom? Could you use one corner?
It would be a nice place for your cave during the day.
Lots of low plastic totes for under the bed storage.
How about half of one of your husbands rooms? No sense in you being the only one to sacrifice.
The couch won't do unless you are only talking about for a week.
How about a large shelf unit in a corner of the living room?
How about the dining room? If there are just the three of you use the kitchen for eating.
Good luck to all of you.
:-D