The Sheraton is the only onsite hotel at the airport. Day use is 139 euro. There is a Steigenberger (roughly like a Hilton) which is a few minute shuttle ride away. It's 109 euro for day use. Alternatively, there are hotels that probably charge less for an overnight stay that are also a shuttle ride away (roughly like a Days Inn). However, I have found that the cheaper hotel's shuttle is only every 30 minutes.