I have never stayed in the WL, but I know they have a category of rooms called deluxe which will sleep 6, other than that, I think all WL rooms only allow 4 plus an infant. These deluxe rooms have 2 queen beds and a sofa sleeper. The sofa sleeper is in it's own "room" - sectioned off by French doors. There are two tvs in these rooms. The description on WDW website makes them sound pretty nice.

In my opinion, though, there are better choices for concierge than the WL. If concierge is what you really want, I would try GF, Poly, CR, or BWI.
I think only a limited number of these rooms at the WL offer concierge service, so if you do want this room type & concierge service be sure to check with CRO when you make the reservation. We are trying a BWI deluxe room in two days. Same type of room, but the sofa sleeper is not closed off from the queen beds at all.
Good luck & happy planning,
Lives4Disney
