I kinda like the idea runescape has with there interiors:
http://media.photobucket.com/image/r...iger/beast.png
http://www.classifiedsduniya.com/wp-...12/559577.jpeg
They definately have a good idea, not that I'm a fan of the game because of the multiple gameplay changes. Another good reference would be skyrim:
http://steamcommunity.com/profiles/7...97985/?tab=all
Especially for layout.
edit:soz images aren't working o_0 so I left you the urls