I have an alternative which can help you in storing the bike...
Select the bike which has quick release options for wheels. There is a small link which needs to be opened and released and the wheel comes off...By this way you can easily park the cycle in ur room or in balcony...
Regarding carrying the cycle for outings. Do the same technique as the quick release option is present for front and back wheels too...
Buddy i also take my cycle 3 floors up and park it in my balcony cz i dont wanna risk a costly cycle by keeping it down....
There are small parking hooks also avaliable in the market where you can easily lift and hook it up on your room wall.... comes in two piece set...
The two thingy stuff is quite confusing and chances of snapping are more, foldables are only meant for recreational purposes where tar is your usage area or else buy a high end foldable bike which can be trusted... Something like KTM (yes KTM does manufacture cycles too, they are costlier than the KTM 200 sold here in India)....
Please give a serious thought regarding this, also a hard tail setup bike would suit your needs...






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