We just got back from our PF/GBurg trip yesterday. I had posted the same question looking for a place to stay that was clean. I had a ressie at the Fairfield Inn in Gburg for $100/night, but wanted a bit cheaper. Went with the Red Roof inn (PF) because good friends of ours always stay there and it was $67/night. It was a clean hotel, but the breakfast was horrible and I like to count on a free breakfast. Disers recommended the Fairfield Inn and the Park Tower as the poster did above. We have also stayed at the Governers Crossing condos and they were very nice. Just no free breakfast, but with the horrible breakfast we had at RRI, we could have stayed at the GC again and had so much more room.
I also agree that you should stay where you will be most of the time. We tend to stay around PF more, so opted to do that.