The Hotel, where we have a block of rooms reserved is: 

 

Fairfield Inn & Suites by Marriott Des Moines Airport
6880 Fleur Drive
Des Moines, IA  50321
Ph#: 515-309-4444

 

The hotel is actually very close to the airport and there is also a shuttle that will take you from the hotel to the reception. 

 

However, if you want something cheaper, there are many other hotels in the area.  Just keep in mind they might not be the nicest...but budgetting is also important.