Ive stayed at all the Marriott hotels in and around Des Moines over the last few years. Here is my take.
I don't like the downtown Marriott. The Savoy is ok but old. Even the redone rooms are just ok. But much better than the Marriott.
The Marriott on the west side is adequate as best.
My favorite? Especially if staying on the west side is the Jordan Creek Courtyard.
http://www.marriott.com/hotels/trave...-jordan-creek/