Expo 2015 Lodging
I'm starting this thread early because the place I normally stay (the Courtyard in Dearborn) fills up pretty quickly - the rooms with two beds are nearly sold out for Expo dates.
I'm booked there from June 22-28. This will be the third time I'm staying there. It's quiet, clean, and they have breakfast (not free). There are also several restaurants and grocery stores nearby.
Edit: It's about a 15 minute drive, same as @Thrax's recommendation