Just returned from my Eastern Europe trip. The trip was great, everything went smoothly as planned including spending the last night at Munich Airport. If someone wants to spend the night at Munich Airport, it is safe, seats have no armrest so you can lie down. Try to stay in Central Area of the airport where a Cafe is open 24 hours and there are rest rooms near by. The Central Area is where you catch a subway to Munich city center. Hope this will be helpful for travelers who can not find an accommodation in Munich during the Oktoberfest.
MJ
Walnut Creek, CA