Congrats on getting into the tandem scene!
However be prepared to have to do some work on it to get it into decent riding condition.
Worked on a 'brand new' Micargi tandem a couple years ago and found that they had absolutely NO grease or trace of grease on any of the bearings. Derailleurs and brakes were not set up properly and were of department store variety. Wheels were way out of true, etc.
Doing your own wrenching would be a +!
Taking it to a bikeshop will co$t about half what you paid for it to make suitable for anything more than just a trip around the block.
Upgrading parts on a Micargi will be costly.
For storage . . .
You can install a steel vinyl coated hook (available in most hardware stores) in shed, porch or even closet in the house and hang the tandem from it's rear or front wheel from the ceiling. Or, use 2 hooks and hang tandem upside down. The bike is on the heavy side so that could take a joint effort from you and your stoker!
Yes there are folding pedals available but hard to come by; they are sometimes used on folding bikes.
Hope this helps!