Well I guess in my idea the whole apartment would be what's in the pocket dimension, in a way. Although my idea was fairly limited (but I like powers that have specific restrictions, they seem more interesting to me), in that the front door could be opened as any door that I actually knew was there.
Doesn't mean I necessarily needed to have been there, I could also check google maps or something I guess.
Also, the view from the windows could be a view from an actual window, but it did become that view, so if something was build in front or if people were being noisy in the street or something, I'd get the consequences. And it couldn't be the view from a place that wasn't a window.
But people in the street if there was one couldn't see me unless I actually bent over and out of the window. Similarly, people couldn't see inside the apartment when I opened a door, they'd see what's actually on the other side of that door like I came out of it. And I couldn't open it if there was already someone in the doorway, too close to the door or if the door was open.
Opening absolutely any door, and not necessarily the same one I came through, could lead back into my apartment if I wanted to. Had to figure it out while opening the door, though. See, the way it went is that the people on the side that became my apartment would see the door as still closed, while the people on the other side would see it open and me getting inside, then closing the door behind me.
I'd also have the option of going through a window if I wanted, I guess, never really thought about that. I guess I'd have to open the window myself, and then the view would change for anyone inside my apartment.
Mmh... That's pretty much all I can think of about it right now. Obviously I've given it a lot of thought, too