The Oak Manor building would be the best location for Royal Room. The mansion bus stop is just behind Magnolia terrace. It's not far, but closer if you have a location closer to Magnolia Terrace. I think it's the East Depot? If you walk over the bridge to lobby you can go to the Main Depot, but I personally don't like it, way too crowded, and depending on park, the route will go around resort and back to East Depot anyway. Parterre Place was my least fav location, we were at the very end, almost in FQ, . But it wasn't horrible. If I were staying in a Royal Room, I'd request Oak on my res.