Bit of advertising here, not sure if it's allowed so ban me.
Me and a few others have a pad for four in vegas (including John "nitizen Eames) over summer but there is a spare room for the 28th May- June 8th. You can stay shorter than the dates I've given but it will basically work out at $60 a night plus $18 a day for our butler/chauffeur.
I don't mind a random staying providing someone I know can vouch for you.
http://www.vegashomevacation.com/photos.htm-Dan Carter