DVC lockoffs refer to a back to back studio and one-bedroom unit with a connecting, locking door. When this door is unlocked it becomes a DVC two-bedroom unit. If you have only reserved the one-bedroom side, this door will be locked by the staff of VWL and occupants of either side will not be able to open it. I always check to make sure the door is indeed locked when I first get there.
In a one-bedroom unit, having a lockoff studio next door doesn't make a big difference. The connection door is in the front hall and doesn't interfer with the unit itself. If you are in a BWV or VWL lockoff studio you won't have a daybed.