I'm still in act 1, but I've left a lot of stuff in my apartment. It all seems to be fine, so I may change my answer later.
Personally, I would have loved a storage locker or something. ;)
Update: I'm back in Detroit and all the stuff I left in my apartment is still there. That said though, there have been some interesting resets outside of the place. Broken walls fixed and moveable objects returned to their initial positions.